Correlated query in SELECT clause

There is a problem when I include correlated query in the SELECT clause in
the SQL statement like the following:
SELECT a.column1, (
SELECT b.column2
FROM b
WHERE b.a_id = a.a_id
) as dummy
FROM a;
(just replace a and b with any related table names from your database)
This query executed without any problems in query designer and in a report.
But when executed from inside report designer (Microsoft Developer
Environment, Data tab) I got the following error:
The column prefix 'a' doesn't match with a table name or alias name used in
the query.
Is it some kind of bug or just 'feature' of Query Designer?Try taking out all carraige returns.
VA wrote:
>There is a problem when I include correlated query in the SELECT clause in
>the SQL statement like the following:
>SELECT a.column1, (
> SELECT b.column2
> FROM b
> WHERE b.a_id = a.a_id
>) as dummy
>FROM a;
>(just replace a and b with any related table names from your database)
>This query executed without any problems in query designer and in a report.
>But when executed from inside report designer (Microsoft Developer
>Environment, Data tab) I got the following error:
>The column prefix 'a' doesn't match with a table name or alias name used in
>the query.
>Is it some kind of bug or just 'feature' of Query Designer?
--
Gene Hunter
Message posted via SQLMonster.com
http://www.sqlmonster.com/Uwe/Forums.aspx/sql-server-reporting/200508/1|||Does it work if you make it a VIEW, and do SELECT * FROM TheView in
your frontend?

correct syntax for this select in SQL Server?

This (demo) statement is fine in Access, and so far as I can see, should
be OK in SQL Server.

But Enterprise Manager barfs at the final bracket. Can anyone help
please?

select sum(field1) as sum1, sum(field2) as sum2 from
(SELECT * from test where id < 3
union
SELECT * from test where id 2)

In fact, I can reduce it to :-

select * from
(SELECT * from test)

with the same effect - clearly I just need telling :-)

cheers,
Jim
--
Jim
a Yorkshire polymothJim Lawton (usenet1@.jimlawton.TAKEOUTinfo) writes:

Quote:

Originally Posted by

This (demo) statement is fine in Access, and so far as I can see, should
be OK in SQL Server.
>
But Enterprise Manager barfs at the final bracket. Can anyone help
please?
>
select sum(field1) as sum1, sum(field2) as sum2 from
(SELECT * from test where id < 3
union
SELECT * from test where id 2)
>
In fact, I can reduce it to :-
>
select * from
(SELECT * from test)
>
with the same effect - clearly I just need telling :-)

In SQL Server, you need to provide an alias for the derived table:

SELECT * FROM (SELECT *FROM test) AS x

--
Erland Sommarskog, SQL Server MVP, esquel@.sommarskog.se
Books Online for SQL Server 2005 at
http://www.microsoft.com/technet/pr...oads/books.mspx
Books Online for SQL Server 2000 at
http://www.microsoft.com/sql/prodin...ions/books.mspx|||Derived tables must be assigned an alias.

select * from
(SELECT * from test) as X

Roy Harvey
Beacon Falls, CT

On Fri, 22 Jun 2007 21:19:31 GMT, Jim Lawton
<usenet1@.jimlawton.TAKEOUTinfowrote:

Quote:

Originally Posted by

>This (demo) statement is fine in Access, and so far as I can see, should
>be OK in SQL Server.
>
>But Enterprise Manager barfs at the final bracket. Can anyone help
>please?
>
>select sum(field1) as sum1, sum(field2) as sum2 from
>(SELECT * from test where id < 3
>union
>SELECT * from test where id 2)
>
>In fact, I can reduce it to :-
>
>select * from
>(SELECT * from test)
>
>with the same effect - clearly I just need telling :-)
>
>
>cheers,
>Jim

|||On Fri, 22 Jun 2007 21:30:17 +0000 (UTC), Erland Sommarskog
<esquel@.sommarskog.sewrote:

Quote:

Originally Posted by

>Jim Lawton (usenet1@.jimlawton.TAKEOUTinfo) writes:

Quote:

Originally Posted by

>This (demo) statement is fine in Access, and so far as I can see, should
>be OK in SQL Server.
>>
>But Enterprise Manager barfs at the final bracket. Can anyone help
>please?
>>
>select sum(field1) as sum1, sum(field2) as sum2 from
>(SELECT * from test where id < 3
>union
>SELECT * from test where id 2)
>>
>In fact, I can reduce it to :-
>>
>select * from
>(SELECT * from test)
>>
>with the same effect - clearly I just need telling :-)

>
>In SQL Server, you need to provide an alias for the derived table:
>
SELECT * FROM (SELECT *FROM test) AS x

Thanks to both you and Roy.
--
Jim
a Yorkshire polymoth|||On Sat, 23 Jun 2007 06:32:00 GMT, Jim Lawton
<usenet1@.jimlawton.TAKEOUTinfowrote:

Quote:

Originally Posted by

>On Fri, 22 Jun 2007 21:30:17 +0000 (UTC), Erland Sommarskog
><esquel@.sommarskog.sewrote:
>

Quote:

Originally Posted by

>>Jim Lawton (usenet1@.jimlawton.TAKEOUTinfo) writes:

Quote:

Originally Posted by

>>This (demo) statement is fine in Access, and so far as I can see, should
>>be OK in SQL Server.
>>>
>>But Enterprise Manager barfs at the final bracket. Can anyone help
>>please?
>>>
>>select sum(field1) as sum1, sum(field2) as sum2 from
>>(SELECT * from test where id < 3
>>union
>>SELECT * from test where id 2)
>>>
>>In fact, I can reduce it to :-
>>>
>>select * from
>>(SELECT * from test)
>>>
>>with the same effect - clearly I just need telling :-)

>>
>>In SQL Server, you need to provide an alias for the derived table:
>>
> SELECT * FROM (SELECT *FROM test) AS x

>

And, actually, and for the record, let's just add, that for this to work
on Oracle we have to omit the "as" - which is OK for SQL Server as well.
--
Jim
a Yorkshire polymoth

correct syntax for ADO.net recordsets Select method.

I have a interger stored in x.

I want to use x in a SELECT statement like so :

SELECT * from aTable WHERE A_Column = x

This select statement is then assigned to and passed as a string like :

sql = "SELECT * from aTable WHERE A_Column = x"

How does the x get interpreted correctly ?Try:

sql = "SELECT * from aTable WHERE A_Column = " & x

Correct SELECT Statement via joins

Hi all,
I cannot quite get my head around these outer/inner joins (if this is what i
need).
Basically I have 2 tables ie
TABLE ITEMS
PRIMARYKEY ITEMNUMBER
FOREIGNKEY LASTSUPPLIER
FOREIGNKEY CURRENTSUPPLIER
TABLE SUPPLIERS
PRIMARYKEY SUPPLIERNUMBER
SUPPLIERNAME
Currently I can get the information I need by using this sort of statement:
SELECT *, (SELECT SUPPLIERNAME FROM SUPPLIERS WHERE SUPPLIERNUMBER =
ITEMS.LASTSUPPLIER) AS LASTSUPPLIERNAME, (SELECT SUPPLIERNAME FROM SUPPLIERS
WHERE SUPPLIERNUMBER = ITEMS.CURRENTSUPPLIER) AS CURRENTSUPPLIERNAME FROM
ITEMS
However this is not how I really want to do it... because I would like to be
able to something like:
as above... WHERE LASTSUPPLIERNAME LIKE '%MICROSOFT%'
however this doesn't work... 'error Invalid column name LASTSUPPLIERNAME'
Could anyone help me with this please?
Thanks
Gav
SELECT i.ITEMNUMBER, l.SUPPLIERNAME, c.SUPPLIERNAME
FROM ITEMS as i
INNER JOIN SUPPLIERS as l on l.SUPPLIERNUMBER = i.LASTSUPPLIER
INNER JOIN SUPPLIERS as c on c.SUPPLIERNUMBER = i.CURRENTSUPPLIER
WHERE l.SUPPLIERNAME LIKE '%MICROSOFT%'
This is assuming you can't have a NULL LASTSUPPLIER or CURRENTSUPPLIER
for a given ITEM row. If you can have nulls then you'd have to change
the INNER joins to OUTER joins (left outer joins) so that you still get
the ITEMNUMBER returned even if you have a NULL last supplier or current
supplier. Also the "LIKE '%something%'" is not a fantastic search
because it will require a complete index scan, ie. it will have to
search every single row in the index from start to end, which is not
terribly efficient.
HTH
*mike hodgson* |/ database administrator/ | mallesons stephen jaques
*T* +61 (2) 9296 3668 |* F* +61 (2) 9296 3885 |* M* +61 (408) 675 907
*E* mailto:mike.hodgson@.mallesons.nospam.com |* W* http://www.mallesons.com
Gav wrote:

>Hi all,
>I cannot quite get my head around these outer/inner joins (if this is what i
>need).
>Basically I have 2 tables ie
>TABLE ITEMS
>PRIMARYKEY ITEMNUMBER
>FOREIGNKEY LASTSUPPLIER
>FOREIGNKEY CURRENTSUPPLIER
>TABLE SUPPLIERS
>PRIMARYKEY SUPPLIERNUMBER
>SUPPLIERNAME
>Currently I can get the information I need by using this sort of statement:
>SELECT *, (SELECT SUPPLIERNAME FROM SUPPLIERS WHERE SUPPLIERNUMBER =
>ITEMS.LASTSUPPLIER) AS LASTSUPPLIERNAME, (SELECT SUPPLIERNAME FROM SUPPLIERS
>WHERE SUPPLIERNUMBER = ITEMS.CURRENTSUPPLIER) AS CURRENTSUPPLIERNAME FROM
>ITEMS
>However this is not how I really want to do it... because I would like to be
>able to something like:
>as above... WHERE LASTSUPPLIERNAME LIKE '%MICROSOFT%'
>however this doesn't work... 'error Invalid column name LASTSUPPLIERNAME'
>Could anyone help me with this please?
>Thanks
>Gav
>
>
|||Gav wrote on Fri, 3 Jun 2005 00:03:20 +0100:

> Hi all,
> I cannot quite get my head around these outer/inner joins (if this is what
> i need).
> Basically I have 2 tables ie
> TABLE ITEMS
> PRIMARYKEY ITEMNUMBER
> FOREIGNKEY LASTSUPPLIER
> FOREIGNKEY CURRENTSUPPLIER
> TABLE SUPPLIERS
> PRIMARYKEY SUPPLIERNUMBER
> SUPPLIERNAME
> Currently I can get the information I need by using this sort of statement:
> SELECT *, (SELECT SUPPLIERNAME FROM SUPPLIERS WHERE SUPPLIERNUMBER =
> ITEMS.LASTSUPPLIER) AS LASTSUPPLIERNAME, (SELECT SUPPLIERNAME FROM
> SUPPLIERS WHERE SUPPLIERNUMBER = ITEMS.CURRENTSUPPLIER) AS
> CURRENTSUPPLIERNAME FROM ITEMS
> However this is not how I really want to do it... because I would like to
> be able to something like:
> as above... WHERE LASTSUPPLIERNAME LIKE '%MICROSOFT%'
> however this doesn't work... 'error Invalid column name LASTSUPPLIERNAME'
> Could anyone help me with this please?
LASTSUPPLIERNAME is not the column name, it's the derived table alias. You'd
need to use LASTSUPPLIERNAME.SUPPLIERNAME to reference the column.
That said, you also still need to work on the joins, see the post from Mike
Hodgson.
Dan
|||Thanks for the reply... however you say the 'LIKE' is not efficient, can you suggest a more efficient way to do this?
Thanks again
Gav
"Mike Hodgson" <mike.hodgson@.mallesons.nospam.com> wrote in message news:%23VzsIQ9ZFHA.2308@.TK2MSFTNGP14.phx.gbl...
SELECT i.ITEMNUMBER, l.SUPPLIERNAME, c.SUPPLIERNAME
FROM ITEMS as i
INNER JOIN SUPPLIERS as l on l.SUPPLIERNUMBER = i.LASTSUPPLIER
INNER JOIN SUPPLIERS as c on c.SUPPLIERNUMBER = i.CURRENTSUPPLIER
WHERE l.SUPPLIERNAME LIKE '%MICROSOFT%'
This is assuming you can't have a NULL LASTSUPPLIER or CURRENTSUPPLIER for a given ITEM row. If you can have nulls then you'd have to change the INNER joins to OUTER joins (left outer joins) so that you still get the ITEMNUMBER returned even if you have a NULL last supplier or current supplier. Also the "LIKE '%something%'" is not a fantastic search because it will require a complete index scan, ie. it will have to search every single row in the index from start to end, which is not terribly efficient.
HTH
mike hodgson | database administrator | mallesons stephen jaques
T +61 (2) 9296 3668 | F +61 (2) 9296 3885 | M +61 (408) 675 907
E mailto:mike.hodgson@.mallesons.nospam.com | W http://www.mallesons.com
Gav wrote:
Hi all,
I cannot quite get my head around these outer/inner joins (if this is what i
need).
Basically I have 2 tables ie
TABLE ITEMS
PRIMARYKEY ITEMNUMBER
FOREIGNKEY LASTSUPPLIER
FOREIGNKEY CURRENTSUPPLIER
TABLE SUPPLIERS
PRIMARYKEY SUPPLIERNUMBER
SUPPLIERNAME
Currently I can get the information I need by using this sort of statement:
SELECT *, (SELECT SUPPLIERNAME FROM SUPPLIERS WHERE SUPPLIERNUMBER =
ITEMS.LASTSUPPLIER) AS LASTSUPPLIERNAME, (SELECT SUPPLIERNAME FROM SUPPLIERS
WHERE SUPPLIERNUMBER = ITEMS.CURRENTSUPPLIER) AS CURRENTSUPPLIERNAME FROM
ITEMS
However this is not how I really want to do it... because I would like to be
able to something like:
as above... WHERE LASTSUPPLIERNAME LIKE '%MICROSOFT%'
however this doesn't work... 'error Invalid column name LASTSUPPLIERNAME'
Could anyone help me with this please?
Thanks
Gav
|||Just tried it out and performance aside it's working great thanks
Gav
"Mike Hodgson" <mike.hodgson@.mallesons.nospam.com> wrote in message news:%23VzsIQ9ZFHA.2308@.TK2MSFTNGP14.phx.gbl...
SELECT i.ITEMNUMBER, l.SUPPLIERNAME, c.SUPPLIERNAME
FROM ITEMS as i
INNER JOIN SUPPLIERS as l on l.SUPPLIERNUMBER = i.LASTSUPPLIER
INNER JOIN SUPPLIERS as c on c.SUPPLIERNUMBER = i.CURRENTSUPPLIER
WHERE l.SUPPLIERNAME LIKE '%MICROSOFT%'
This is assuming you can't have a NULL LASTSUPPLIER or CURRENTSUPPLIER for a given ITEM row. If you can have nulls then you'd have to change the INNER joins to OUTER joins (left outer joins) so that you still get the ITEMNUMBER returned even if you have a NULL last supplier or current supplier. Also the "LIKE '%something%'" is not a fantastic search because it will require a complete index scan, ie. it will have to search every single row in the index from start to end, which is not terribly efficient.
HTH
mike hodgson | database administrator | mallesons stephen jaques
T +61 (2) 9296 3668 | F +61 (2) 9296 3885 | M +61 (408) 675 907
E mailto:mike.hodgson@.mallesons.nospam.com | W http://www.mallesons.com
Gav wrote:
Hi all,
I cannot quite get my head around these outer/inner joins (if this is what i
need).
Basically I have 2 tables ie
TABLE ITEMS
PRIMARYKEY ITEMNUMBER
FOREIGNKEY LASTSUPPLIER
FOREIGNKEY CURRENTSUPPLIER
TABLE SUPPLIERS
PRIMARYKEY SUPPLIERNUMBER
SUPPLIERNAME
Currently I can get the information I need by using this sort of statement:
SELECT *, (SELECT SUPPLIERNAME FROM SUPPLIERS WHERE SUPPLIERNUMBER =
ITEMS.LASTSUPPLIER) AS LASTSUPPLIERNAME, (SELECT SUPPLIERNAME FROM SUPPLIERS
WHERE SUPPLIERNUMBER = ITEMS.CURRENTSUPPLIER) AS CURRENTSUPPLIERNAME FROM
ITEMS
However this is not how I really want to do it... because I would like to be
able to something like:
as above... WHERE LASTSUPPLIERNAME LIKE '%MICROSOFT%'
however this doesn't work... 'error Invalid column name LASTSUPPLIERNAME'
Could anyone help me with this please?
Thanks
Gav
|||There's nothing wrong with the LIKE operator per se. It's just when you
you compare it to a string that begins with '%' (such as '%MICROSOFT%'),
which basically means this data could start with anything and so could
be anywhere in the index so I'd better scan the entire index so we find
all occurrences. Just make the search more specific.
*mike hodgson* |/ database administrator/ | mallesons stephen jaques
*T* +61 (2) 9296 3668 |* F* +61 (2) 9296 3885 |* M* +61 (408) 675 907
*E* mailto:mike.hodgson@.mallesons.nospam.com |* W* http://www.mallesons.com
Gav wrote:
[vbcol=seagreen]
> Thanks for the reply... however you say the 'LIKE' is not efficient,
> can you suggest a more efficient way to do this?
> Thanks again
> Gav
> "Mike Hodgson" <mike.hodgson@.mallesons.nospam.com
> <mailto:mike.hodgson@.mallesons.nospam.com>> wrote in message
> news:%23VzsIQ9ZFHA.2308@.TK2MSFTNGP14.phx.gbl...
> SELECT i.ITEMNUMBER, l.SUPPLIERNAME, c.SUPPLIERNAME
> FROM ITEMS as i
> INNER JOIN SUPPLIERS as l on l.SUPPLIERNUMBER = i.LASTSUPPLIER
> INNER JOIN SUPPLIERS as c on c.SUPPLIERNUMBER =
> i.CURRENTSUPPLIER
> WHERE l.SUPPLIERNAME LIKE '%MICROSOFT%'
>
> This is assuming you can't have a NULL LASTSUPPLIER or
> CURRENTSUPPLIER for a given ITEM row. If you can have nulls then
> you'd have to change the INNER joins to OUTER joins (left outer
> joins) so that you still get the ITEMNUMBER returned even if you
> have a NULL last supplier or current supplier. Also the "LIKE
> '%something%'" is not a fantastic search because it will require a
> complete index scan, ie. it will have to search every single row
> in the index from start to end, which is not terribly efficient.
> HTH
> --
> *mike hodgson* |/ database administrator/ | mallesons stephen jaques
> *T* +61 (2) 9296 3668 |* F* +61 (2) 9296 3885 |* M* +61 (408) 675 907
> *E* mailto:mike.hodgson@.mallesons.nospam.com |* W*
> http://www.mallesons.com
>
> Gav wrote:

Correct SELECT Statement via joins

Hi all,
I cannot quite get my head around these outer/inner joins (if this is what i
need).
Basically I have 2 tables ie
TABLE ITEMS
PRIMARYKEY ITEMNUMBER
FOREIGNKEY LASTSUPPLIER
FOREIGNKEY CURRENTSUPPLIER
TABLE SUPPLIERS
PRIMARYKEY SUPPLIERNUMBER
SUPPLIERNAME
Currently I can get the information I need by using this sort of statement:
SELECT *, (SELECT SUPPLIERNAME FROM SUPPLIERS WHERE SUPPLIERNUMBER =
ITEMS.LASTSUPPLIER) AS LASTSUPPLIERNAME, (SELECT SUPPLIERNAME FROM SUPPLIERS
WHERE SUPPLIERNUMBER = ITEMS.CURRENTSUPPLIER) AS CURRENTSUPPLIERNAME FROM
ITEMS
However this is not how I really want to do it... because I would like to be
able to something like:
as above... WHERE LASTSUPPLIERNAME LIKE '%MICROSOFT%'
however this doesn't work... 'error Invalid column name LASTSUPPLIERNAME'
Could anyone help me with this please?
Thanks
GavSELECT i.ITEMNUMBER, l.SUPPLIERNAME, c.SUPPLIERNAME
FROM ITEMS as i
INNER JOIN SUPPLIERS as l on l.SUPPLIERNUMBER = i.LASTSUPPLIER
INNER JOIN SUPPLIERS as c on c.SUPPLIERNUMBER = i.CURRENTSUPPLIER
WHERE l.SUPPLIERNAME LIKE '%MICROSOFT%'
This is assuming you can't have a NULL LASTSUPPLIER or CURRENTSUPPLIER
for a given ITEM row. If you can have nulls then you'd have to change
the INNER joins to OUTER joins (left outer joins) so that you still get
the ITEMNUMBER returned even if you have a NULL last supplier or current
supplier. Also the "LIKE '%something%'" is not a fantastic search
because it will require a complete index scan, ie. it will have to
search every single row in the index from start to end, which is not
terribly efficient.
HTH
*mike hodgson* |/ database administrator/ | mallesons stephen jaques
*T* +61 (2) 9296 3668 |* F* +61 (2) 9296 3885 |* M* +61 (408) 675 907
*E* mailto:mike.hodgson@.mallesons.nospam.com |* W* http://www.mallesons.com
Gav wrote:

>Hi all,
>I cannot quite get my head around these outer/inner joins (if this is what
i
>need).
>Basically I have 2 tables ie
>TABLE ITEMS
>PRIMARYKEY ITEMNUMBER
>FOREIGNKEY LASTSUPPLIER
>FOREIGNKEY CURRENTSUPPLIER
>TABLE SUPPLIERS
>PRIMARYKEY SUPPLIERNUMBER
>SUPPLIERNAME
>Currently I can get the information I need by using this sort of statement:
>SELECT *, (SELECT SUPPLIERNAME FROM SUPPLIERS WHERE SUPPLIERNUMBER =
>ITEMS.LASTSUPPLIER) AS LASTSUPPLIERNAME, (SELECT SUPPLIERNAME FROM SUPPLIER
S
>WHERE SUPPLIERNUMBER = ITEMS.CURRENTSUPPLIER) AS CURRENTSUPPLIERNAME FROM
>ITEMS
>However this is not how I really want to do it... because I would like to b
e
>able to something like:
>as above... WHERE LASTSUPPLIERNAME LIKE '%MICROSOFT%'
>however this doesn't work... 'error Invalid column name LASTSUPPLIERNAME'
>Could anyone help me with this please?
>Thanks
>Gav
>
>|||Gav wrote on Fri, 3 Jun 2005 00:03:20 +0100:

> Hi all,
> I cannot quite get my head around these outer/inner joins (if this is what
> i need).
> Basically I have 2 tables ie
> TABLE ITEMS
> PRIMARYKEY ITEMNUMBER
> FOREIGNKEY LASTSUPPLIER
> FOREIGNKEY CURRENTSUPPLIER
> TABLE SUPPLIERS
> PRIMARYKEY SUPPLIERNUMBER
> SUPPLIERNAME
> Currently I can get the information I need by using this sort of statement
:
> SELECT *, (SELECT SUPPLIERNAME FROM SUPPLIERS WHERE SUPPLIERNUMBER =
> ITEMS.LASTSUPPLIER) AS LASTSUPPLIERNAME, (SELECT SUPPLIERNAME FROM
> SUPPLIERS WHERE SUPPLIERNUMBER = ITEMS.CURRENTSUPPLIER) AS
> CURRENTSUPPLIERNAME FROM ITEMS
> However this is not how I really want to do it... because I would like to
> be able to something like:
> as above... WHERE LASTSUPPLIERNAME LIKE '%MICROSOFT%'
> however this doesn't work... 'error Invalid column name LASTSUPPLIERNAME'
> Could anyone help me with this please?
LASTSUPPLIERNAME is not the column name, it's the derived table alias. You'd
need to use LASTSUPPLIERNAME.SUPPLIERNAME to reference the column.
That said, you also still need to work on the joins, see the post from Mike
Hodgson.
Dan|||Thanks for the reply... however you say the 'LIKE' is not efficient, can you
suggest a more efficient way to do this?
Thanks again
Gav
"Mike Hodgson" <mike.hodgson@.mallesons.nospam.com> wrote in message news:%23
VzsIQ9ZFHA.2308@.TK2MSFTNGP14.phx.gbl...
SELECT i.ITEMNUMBER, l.SUPPLIERNAME, c.SUPPLIERNAME
FROM ITEMS as i
INNER JOIN SUPPLIERS as l on l.SUPPLIERNUMBER = i.LASTSUPPLIER
INNER JOIN SUPPLIERS as c on c.SUPPLIERNUMBER = i.CURRENTSUPPLIER
WHERE l.SUPPLIERNAME LIKE '%MICROSOFT%'
This is assuming you can't have a NULL LASTSUPPLIER or CURRENTSUPPLIER for a
given ITEM row. If you can have nulls then you'd have to change the INNER
joins to OUTER joins (left outer joins) so that you still get the ITEMNUMBER
returned even if you have a NULL last supplier or current supplier. Also t
he "LIKE '%something%'" is not a fantastic search because it will require a
complete index scan, ie. it will have to search every single row in the inde
x from start to end, which is not terribly efficient.
HTH
mike hodgson | database administrator | mallesons stephen jaques
T +61 (2) 9296 3668 | F +61 (2) 9296 3885 | M +61 (408) 675 907
E mailto:mike.hodgson@.mallesons.nospam.com | W http://www.mallesons.com
Gav wrote:
Hi all,
I cannot quite get my head around these outer/inner joins (if this is what i
need).
Basically I have 2 tables ie
TABLE ITEMS
PRIMARYKEY ITEMNUMBER
FOREIGNKEY LASTSUPPLIER
FOREIGNKEY CURRENTSUPPLIER
TABLE SUPPLIERS
PRIMARYKEY SUPPLIERNUMBER
SUPPLIERNAME
Currently I can get the information I need by using this sort of statement:
SELECT *, (SELECT SUPPLIERNAME FROM SUPPLIERS WHERE SUPPLIERNUMBER =
ITEMS.LASTSUPPLIER) AS LASTSUPPLIERNAME, (SELECT SUPPLIERNAME FROM SUPPLIERS
WHERE SUPPLIERNUMBER = ITEMS.CURRENTSUPPLIER) AS CURRENTSUPPLIERNAME FROM
ITEMS
However this is not how I really want to do it... because I would like to be
able to something like:
as above... WHERE LASTSUPPLIERNAME LIKE '%MICROSOFT%'
however this doesn't work... 'error Invalid column name LASTSUPPLIERNAME'
Could anyone help me with this please?
Thanks
Gav|||Just tried it out and performance aside it's working great thanks
Gav
"Mike Hodgson" <mike.hodgson@.mallesons.nospam.com> wrote in message news:%23
VzsIQ9ZFHA.2308@.TK2MSFTNGP14.phx.gbl...
SELECT i.ITEMNUMBER, l.SUPPLIERNAME, c.SUPPLIERNAME
FROM ITEMS as i
INNER JOIN SUPPLIERS as l on l.SUPPLIERNUMBER = i.LASTSUPPLIER
INNER JOIN SUPPLIERS as c on c.SUPPLIERNUMBER = i.CURRENTSUPPLIER
WHERE l.SUPPLIERNAME LIKE '%MICROSOFT%'
This is assuming you can't have a NULL LASTSUPPLIER or CURRENTSUPPLIER for a
given ITEM row. If you can have nulls then you'd have to change the INNER
joins to OUTER joins (left outer joins) so that you still get the ITEMNUMBER
returned even if you have a NULL last supplier or current supplier. Also t
he "LIKE '%something%'" is not a fantastic search because it will require a
complete index scan, ie. it will have to search every single row in the inde
x from start to end, which is not terribly efficient.
HTH
mike hodgson | database administrator | mallesons stephen jaques
T +61 (2) 9296 3668 | F +61 (2) 9296 3885 | M +61 (408) 675 907
E mailto:mike.hodgson@.mallesons.nospam.com | W http://www.mallesons.com
Gav wrote:
Hi all,
I cannot quite get my head around these outer/inner joins (if this is what i
need).
Basically I have 2 tables ie
TABLE ITEMS
PRIMARYKEY ITEMNUMBER
FOREIGNKEY LASTSUPPLIER
FOREIGNKEY CURRENTSUPPLIER
TABLE SUPPLIERS
PRIMARYKEY SUPPLIERNUMBER
SUPPLIERNAME
Currently I can get the information I need by using this sort of statement:
SELECT *, (SELECT SUPPLIERNAME FROM SUPPLIERS WHERE SUPPLIERNUMBER =
ITEMS.LASTSUPPLIER) AS LASTSUPPLIERNAME, (SELECT SUPPLIERNAME FROM SUPPLIERS
WHERE SUPPLIERNUMBER = ITEMS.CURRENTSUPPLIER) AS CURRENTSUPPLIERNAME FROM
ITEMS
However this is not how I really want to do it... because I would like to be
able to something like:
as above... WHERE LASTSUPPLIERNAME LIKE '%MICROSOFT%'
however this doesn't work... 'error Invalid column name LASTSUPPLIERNAME'
Could anyone help me with this please?
Thanks
Gav|||There's nothing wrong with the LIKE operator per se. It's just when you
you compare it to a string that begins with '%' (such as '%MICROSOFT%'),
which basically means this data could start with anything and so could
be anywhere in the index so I'd better scan the entire index so we find
all occurrences. Just make the search more specific.
*mike hodgson* |/ database administrator/ | mallesons stephen jaques
*T* +61 (2) 9296 3668 |* F* +61 (2) 9296 3885 |* M* +61 (408) 675 907
*E* mailto:mike.hodgson@.mallesons.nospam.com |* W* http://www.mallesons.com
Gav wrote:
[vbcol=seagreen]
> Thanks for the reply... however you say the 'LIKE' is not efficient,
> can you suggest a more efficient way to do this?
> Thanks again
> Gav
> "Mike Hodgson" <mike.hodgson@.mallesons.nospam.com
> <mailto:mike.hodgson@.mallesons.nospam.com>> wrote in message
> news:%23VzsIQ9ZFHA.2308@.TK2MSFTNGP14.phx.gbl...
> SELECT i.ITEMNUMBER, l.SUPPLIERNAME, c.SUPPLIERNAME
> FROM ITEMS as i
> INNER JOIN SUPPLIERS as l on l.SUPPLIERNUMBER = i.LASTSUPPLIER
> INNER JOIN SUPPLIERS as c on c.SUPPLIERNUMBER =
> i.CURRENTSUPPLIER
> WHERE l.SUPPLIERNAME LIKE '%MICROSOFT%'
>
> This is assuming you can't have a NULL LASTSUPPLIER or
> CURRENTSUPPLIER for a given ITEM row. If you can have nulls then
> you'd have to change the INNER joins to OUTER joins (left outer
> joins) so that you still get the ITEMNUMBER returned even if you
> have a NULL last supplier or current supplier. Also the "LIKE
> '%something%'" is not a fantastic search because it will require a
> complete index scan, ie. it will have to search every single row
> in the index from start to end, which is not terribly efficient.
> HTH
> --
> *mike hodgson* |/ database administrator/ | mallesons stephen jaques
> *T* +61 (2) 9296 3668 |* F* +61 (2) 9296 3885 |* M* +61 (408) 675 907
> *E* mailto:mike.hodgson@.mallesons.nospam.com |* W*
> http://www.mallesons.com
>
> Gav wrote:
>

Correct SELECT Statement via joins

Hi all,
I cannot quite get my head around these outer/inner joins (if this is what i
need).
Basically I have 2 tables ie
TABLE ITEMS
PRIMARYKEY ITEMNUMBER
FOREIGNKEY LASTSUPPLIER
FOREIGNKEY CURRENTSUPPLIER
TABLE SUPPLIERS
PRIMARYKEY SUPPLIERNUMBER
SUPPLIERNAME
Currently I can get the information I need by using this sort of statement:
SELECT *, (SELECT SUPPLIERNAME FROM SUPPLIERS WHERE SUPPLIERNUMBER = ITEMS.LASTSUPPLIER) AS LASTSUPPLIERNAME, (SELECT SUPPLIERNAME FROM SUPPLIERS
WHERE SUPPLIERNUMBER = ITEMS.CURRENTSUPPLIER) AS CURRENTSUPPLIERNAME FROM
ITEMS
However this is not how I really want to do it... because I would like to be
able to something like:
as above... WHERE LASTSUPPLIERNAME LIKE '%MICROSOFT%'
however this doesn't work... 'error Invalid column name LASTSUPPLIERNAME'
Could anyone help me with this please?
Thanks
GavThis is a multi-part message in MIME format.
--090105020707090300000908
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit
SELECT i.ITEMNUMBER, l.SUPPLIERNAME, c.SUPPLIERNAME
FROM ITEMS as i
INNER JOIN SUPPLIERS as l on l.SUPPLIERNUMBER = i.LASTSUPPLIER
INNER JOIN SUPPLIERS as c on c.SUPPLIERNUMBER = i.CURRENTSUPPLIER
WHERE l.SUPPLIERNAME LIKE '%MICROSOFT%'
This is assuming you can't have a NULL LASTSUPPLIER or CURRENTSUPPLIER
for a given ITEM row. If you can have nulls then you'd have to change
the INNER joins to OUTER joins (left outer joins) so that you still get
the ITEMNUMBER returned even if you have a NULL last supplier or current
supplier. Also the "LIKE '%something%'" is not a fantastic search
because it will require a complete index scan, ie. it will have to
search every single row in the index from start to end, which is not
terribly efficient.
HTH
--
*mike hodgson* |/ database administrator/ | mallesons stephen jaques
*T* +61 (2) 9296 3668 |* F* +61 (2) 9296 3885 |* M* +61 (408) 675 907
*E* mailto:mike.hodgson@.mallesons.nospam.com |* W* http://www.mallesons.com
Gav wrote:
>Hi all,
>I cannot quite get my head around these outer/inner joins (if this is what i
>need).
>Basically I have 2 tables ie
>TABLE ITEMS
>PRIMARYKEY ITEMNUMBER
>FOREIGNKEY LASTSUPPLIER
>FOREIGNKEY CURRENTSUPPLIER
>TABLE SUPPLIERS
>PRIMARYKEY SUPPLIERNUMBER
>SUPPLIERNAME
>Currently I can get the information I need by using this sort of statement:
>SELECT *, (SELECT SUPPLIERNAME FROM SUPPLIERS WHERE SUPPLIERNUMBER =>ITEMS.LASTSUPPLIER) AS LASTSUPPLIERNAME, (SELECT SUPPLIERNAME FROM SUPPLIERS
>WHERE SUPPLIERNUMBER = ITEMS.CURRENTSUPPLIER) AS CURRENTSUPPLIERNAME FROM
>ITEMS
>However this is not how I really want to do it... because I would like to be
>able to something like:
>as above... WHERE LASTSUPPLIERNAME LIKE '%MICROSOFT%'
>however this doesn't work... 'error Invalid column name LASTSUPPLIERNAME'
>Could anyone help me with this please?
>Thanks
>Gav
>
>
--090105020707090300000908
Content-Type: text/html; charset=ISO-8859-1
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta content="text/html;charset=ISO-8859-1" http-equiv="Content-Type">
</head>
<body bgcolor="#ffffff" text="#000000">
<blockquote><tt>SELECT i.ITEMNUMBER, l.SUPPLIERNAME, c.SUPPLIERNAME</tt><br>
<tt>FROM ITEMS as i</tt><br>
<tt> INNER JOIN SUPPLIERS as l on l.SUPPLIERNUMBER = i.LASTSUPPLIER</tt><br>
<tt> INNER JOIN SUPPLIERS as c on c.SUPPLIERNUMBER =i.CURRENTSUPPLIER</tt><br>
<tt>WHERE l.SUPPLIERNAME LIKE '%MICROSOFT%'</tt><br>
</blockquote>
<tt><br>
This is assuming you can't have a NULL LASTSUPPLIER or CURRENTSUPPLIER
for a given ITEM row. If you can have nulls then you'd have to change
the INNER joins to OUTER joins (left outer joins) so that you still get
the ITEMNUMBER returned even if you have a NULL last supplier or
current supplier. Also the "LIKE '%something%'" is not a fantastic
search because it will require a complete index scan, ie. it will have
to search every single row in the index from start to end, which is not
terribly efficient.<br>
<br>
HTH<br>
</tt>
<div class="moz-signature">
<title></title>
<meta http-equiv="Content-Type" content="text/html; ">
<p><span lang="en-au"><font face="Tahoma" size="2">--<br>
</font> </span><b><span lang="en-au"><font face="Tahoma" size="2">mike
hodgson</font></span></b><span lang="en-au"> <font face="Tahoma"
size="2">|</font><i><font face="Tahoma"> </font><font face="Tahoma"
size="2"> database administrator</font></i><font face="Tahoma" size="2">
| mallesons</font><font face="Tahoma"> </font><font face="Tahoma"
size="2">stephen</font><font face="Tahoma"> </font><font face="Tahoma"
size="2"> jaques</font><font face="Tahoma"><br>
</font><b><font face="Tahoma" size="2">T</font></b><font face="Tahoma"
size="2"> +61 (2) 9296 3668 |</font><b><font face="Tahoma"> </font><font
face="Tahoma" size="2"> F</font></b><font face="Tahoma" size="2"> +61
(2) 9296 3885 |</font><b><font face="Tahoma"> </font><font
face="Tahoma" size="2">M</font></b><font face="Tahoma" size="2"> +61
(408) 675 907</font><br>
<b><font face="Tahoma" size="2">E</font></b><font face="Tahoma" size="2">
<a href="http://links.10026.com/?link=mailto:mike.hodgson@.mallesons.nospam.com">
mailto:mike.hodgson@.mallesons.nospam.com</a> |</font><b><font
face="Tahoma"> </font><font face="Tahoma" size="2">W</font></b><font
face="Tahoma" size="2"> <a href="http://links.10026.com/?link=/">http://www.mallesons.com">
http://www.mallesons.com</a></font></span> </p>
</div>
<br>
<br>
Gav wrote:
<blockquote cite="midu0PpRd8ZFHA.2520@.TK2MSFTNGP09.phx.gbl" type="cite">
<pre wrap="">Hi all,
I cannot quite get my head around these outer/inner joins (if this is what i
need).
Basically I have 2 tables ie
TABLE ITEMS
PRIMARYKEY ITEMNUMBER
FOREIGNKEY LASTSUPPLIER
FOREIGNKEY CURRENTSUPPLIER
TABLE SUPPLIERS
PRIMARYKEY SUPPLIERNUMBER
SUPPLIERNAME
Currently I can get the information I need by using this sort of statement:
SELECT *, (SELECT SUPPLIERNAME FROM SUPPLIERS WHERE SUPPLIERNUMBER =ITEMS.LASTSUPPLIER) AS LASTSUPPLIERNAME, (SELECT SUPPLIERNAME FROM SUPPLIERS
WHERE SUPPLIERNUMBER = ITEMS.CURRENTSUPPLIER) AS CURRENTSUPPLIERNAME FROM
ITEMS
However this is not how I really want to do it... because I would like to be
able to something like:
as above... WHERE LASTSUPPLIERNAME LIKE '%MICROSOFT%'
however this doesn't work... 'error Invalid column name LASTSUPPLIERNAME'
Could anyone help me with this please?
Thanks
Gav
</pre>
</blockquote>
</body>
</html>
--090105020707090300000908--|||Gav wrote on Fri, 3 Jun 2005 00:03:20 +0100:
> Hi all,
> I cannot quite get my head around these outer/inner joins (if this is what
> i need).
> Basically I have 2 tables ie
> TABLE ITEMS
> PRIMARYKEY ITEMNUMBER
> FOREIGNKEY LASTSUPPLIER
> FOREIGNKEY CURRENTSUPPLIER
> TABLE SUPPLIERS
> PRIMARYKEY SUPPLIERNUMBER
> SUPPLIERNAME
> Currently I can get the information I need by using this sort of statement:
> SELECT *, (SELECT SUPPLIERNAME FROM SUPPLIERS WHERE SUPPLIERNUMBER => ITEMS.LASTSUPPLIER) AS LASTSUPPLIERNAME, (SELECT SUPPLIERNAME FROM
> SUPPLIERS WHERE SUPPLIERNUMBER = ITEMS.CURRENTSUPPLIER) AS
> CURRENTSUPPLIERNAME FROM ITEMS
> However this is not how I really want to do it... because I would like to
> be able to something like:
> as above... WHERE LASTSUPPLIERNAME LIKE '%MICROSOFT%'
> however this doesn't work... 'error Invalid column name LASTSUPPLIERNAME'
> Could anyone help me with this please?
LASTSUPPLIERNAME is not the column name, it's the derived table alias. You'd
need to use LASTSUPPLIERNAME.SUPPLIERNAME to reference the column.
That said, you also still need to work on the joins, see the post from Mike
Hodgson.
Dan|||This is a multi-part message in MIME format.
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Thanks for the reply... however you say the 'LIKE' is not efficient, can =you suggest a more efficient way to do this?
Thanks again
Gav
"Mike Hodgson" <mike.hodgson@.mallesons.nospam.com> wrote in message =news:%23VzsIQ9ZFHA.2308@.TK2MSFTNGP14.phx.gbl...
SELECT i.ITEMNUMBER, l.SUPPLIERNAME, c.SUPPLIERNAME
FROM ITEMS as i
INNER JOIN SUPPLIERS as l on l.SUPPLIERNUMBER =3D i.LASTSUPPLIER
INNER JOIN SUPPLIERS as c on c.SUPPLIERNUMBER =3D =i.CURRENTSUPPLIER
WHERE l.SUPPLIERNAME LIKE '%MICROSOFT%'
This is assuming you can't have a NULL LASTSUPPLIER or CURRENTSUPPLIER =for a given ITEM row. If you can have nulls then you'd have to change =the INNER joins to OUTER joins (left outer joins) so that you still get =the ITEMNUMBER returned even if you have a NULL last supplier or current =supplier. Also the "LIKE '%something%'" is not a fantastic search =because it will require a complete index scan, ie. it will have to =search every single row in the index from start to end, which is not =terribly efficient.
HTH
--
mike hodgson | database administrator | mallesons stephen jaques
T +61 (2) 9296 3668 | F +61 (2) 9296 3885 | M +61 (408) 675 907
E mailto:mike.hodgson@.mallesons.nospam.com | W =http://www.mallesons.com=20
Gav wrote: Hi all,
I cannot quite get my head around these outer/inner joins (if this is =what i need).
Basically I have 2 tables ie
TABLE ITEMS
PRIMARYKEY ITEMNUMBER
FOREIGNKEY LASTSUPPLIER
FOREIGNKEY CURRENTSUPPLIER
TABLE SUPPLIERS
PRIMARYKEY SUPPLIERNUMBER
SUPPLIERNAME
Currently I can get the information I need by using this sort of =statement:
SELECT *, (SELECT SUPPLIERNAME FROM SUPPLIERS WHERE SUPPLIERNUMBER =3D ITEMS.LASTSUPPLIER) AS LASTSUPPLIERNAME, (SELECT SUPPLIERNAME FROM =SUPPLIERS WHERE SUPPLIERNUMBER =3D ITEMS.CURRENTSUPPLIER) AS CURRENTSUPPLIERNAME =FROM ITEMS
However this is not how I really want to do it... because I would like =to be able to something like:
as above... WHERE LASTSUPPLIERNAME LIKE '%MICROSOFT%'
however this doesn't work... 'error Invalid column name =LASTSUPPLIERNAME'
Could anyone help me with this please?
Thanks
Gav
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&

---

Thanks for the reply... however you say =the 'LIKE' is not efficient, can you suggest a more efficient way to do =this?
Thanks again
Gav
"Mike Hodgson" wrote in message news:%23VzsIQ9ZFHA.=2308@.TK2MSFTNGP14.phx.gbl...
SELECT i.ITEMNUMBER, l.SUPPLIERNAME, c.SUPPLIERNAMEFROM ITEMS as =i INNER JOIN SUPPLIERS as l on l.SUPPLIERNUMBER =3D i.LASTSUPPLIER INNER JOIN SUPPLIERS =as c on c.SUPPLIERNUMBER =3D i.CURRENTSUPPLIERWHERE =l.SUPPLIERNAME LIKE '%MICROSOFT%'This is assuming you =can't have a NULL LASTSUPPLIER or CURRENTSUPPLIER for a given ITEM row. If =you can have nulls then you'd have to change the INNER joins to OUTER joins =(left outer joins) so that you still get the ITEMNUMBER returned even if you =have a NULL last supplier or current supplier. Also the "LIKE ='%something%'" is not a fantastic search because it will require a complete index scan, =ie. it will have to search every single row in the index from start to end, =which is not terribly efficient.HTH
--mike =hodgson | database =administrator | mallesons =stephen jaquesT +61 (2) 9296 3668 | F +61 (2) 9296 3885 | M +61 (408) 675 907E mailto:mike.hodgson@.mal=lesons.nospam.com | W http://www.mallesons.com Gav wrote: Hi all,
I cannot quite get my head around these outer/inner joins (if this is =what i need).
Basically I have 2 tables ie
TABLE ITEMS
PRIMARYKEY ITEMNUMBER
FOREIGNKEY LASTSUPPLIER
FOREIGNKEY CURRENTSUPPLIER
TABLE SUPPLIERS
PRIMARYKEY SUPPLIERNUMBER
SUPPLIERNAME
Currently I can get the information I need by using this sort of =statement:
SELECT *, (SELECT SUPPLIERNAME FROM SUPPLIERS WHERE SUPPLIERNUMBER =3D ITEMS.LASTSUPPLIER) AS LASTSUPPLIERNAME, (SELECT SUPPLIERNAME FROM =SUPPLIERS WHERE SUPPLIERNUMBER =3D ITEMS.CURRENTSUPPLIER) AS CURRENTSUPPLIERNAME =FROM ITEMS
However this is not how I really want to do it... because I would like =to be able to something like:
as above... WHERE LASTSUPPLIERNAME LIKE '%MICROSOFT%'
however this doesn't work... 'error Invalid column name =LASTSUPPLIERNAME'
Could anyone help me with this please?
Thanks
Gav

---

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Just tried it out and performance aside it's working great thanks
Gav
"Mike Hodgson" <mike.hodgson@.mallesons.nospam.com> wrote in message =news:%23VzsIQ9ZFHA.2308@.TK2MSFTNGP14.phx.gbl...
SELECT i.ITEMNUMBER, l.SUPPLIERNAME, c.SUPPLIERNAME
FROM ITEMS as i
INNER JOIN SUPPLIERS as l on l.SUPPLIERNUMBER =3D i.LASTSUPPLIER
INNER JOIN SUPPLIERS as c on c.SUPPLIERNUMBER =3D =i.CURRENTSUPPLIER
WHERE l.SUPPLIERNAME LIKE '%MICROSOFT%'
This is assuming you can't have a NULL LASTSUPPLIER or CURRENTSUPPLIER =for a given ITEM row. If you can have nulls then you'd have to change =the INNER joins to OUTER joins (left outer joins) so that you still get =the ITEMNUMBER returned even if you have a NULL last supplier or current =supplier. Also the "LIKE '%something%'" is not a fantastic search =because it will require a complete index scan, ie. it will have to =search every single row in the index from start to end, which is not =terribly efficient.
HTH
--
mike hodgson | database administrator | mallesons stephen jaques
T +61 (2) 9296 3668 | F +61 (2) 9296 3885 | M +61 (408) 675 907
E mailto:mike.hodgson@.mallesons.nospam.com | W =http://www.mallesons.com=20
Gav wrote: Hi all,
I cannot quite get my head around these outer/inner joins (if this is =what i need).
Basically I have 2 tables ie
TABLE ITEMS
PRIMARYKEY ITEMNUMBER
FOREIGNKEY LASTSUPPLIER
FOREIGNKEY CURRENTSUPPLIER
TABLE SUPPLIERS
PRIMARYKEY SUPPLIERNUMBER
SUPPLIERNAME
Currently I can get the information I need by using this sort of =statement:
SELECT *, (SELECT SUPPLIERNAME FROM SUPPLIERS WHERE SUPPLIERNUMBER =3D ITEMS.LASTSUPPLIER) AS LASTSUPPLIERNAME, (SELECT SUPPLIERNAME FROM =SUPPLIERS WHERE SUPPLIERNUMBER =3D ITEMS.CURRENTSUPPLIER) AS CURRENTSUPPLIERNAME =FROM ITEMS
However this is not how I really want to do it... because I would like =to be able to something like:
as above... WHERE LASTSUPPLIERNAME LIKE '%MICROSOFT%'
however this doesn't work... 'error Invalid column name =LASTSUPPLIERNAME'
Could anyone help me with this please?
Thanks
Gav
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Just tried it out and performance aside =it's working great thanks
Gav
"Mike Hodgson" wrote in message news:%23VzsIQ9ZFHA.=2308@.TK2MSFTNGP14.phx.gbl...
SELECT i.ITEMNUMBER, l.SUPPLIERNAME, c.SUPPLIERNAMEFROM ITEMS as =i INNER JOIN SUPPLIERS as l on l.SUPPLIERNUMBER =3D i.LASTSUPPLIER INNER JOIN SUPPLIERS =as c on c.SUPPLIERNUMBER =3D i.CURRENTSUPPLIERWHERE =l.SUPPLIERNAME LIKE '%MICROSOFT%'This is assuming you =can't have a NULL LASTSUPPLIER or CURRENTSUPPLIER for a given ITEM row. If =you can have nulls then you'd have to change the INNER joins to OUTER joins =(left outer joins) so that you still get the ITEMNUMBER returned even if you =have a NULL last supplier or current supplier. Also the "LIKE ='%something%'" is not a fantastic search because it will require a complete index scan, =ie. it will have to search every single row in the index from start to end, =which is not terribly efficient.HTH
--mike =hodgson | database =administrator | mallesons =stephen jaquesT +61 (2) 9296 3668 | F +61 (2) 9296 3885 | M +61 (408) 675 907E mailto:mike.hodgson@.mal=lesons.nospam.com | W http://www.mallesons.com Gav wrote: Hi all,
I cannot quite get my head around these outer/inner joins (if this is =what i need).
Basically I have 2 tables ie
TABLE ITEMS
PRIMARYKEY ITEMNUMBER
FOREIGNKEY LASTSUPPLIER
FOREIGNKEY CURRENTSUPPLIER
TABLE SUPPLIERS
PRIMARYKEY SUPPLIERNUMBER
SUPPLIERNAME
Currently I can get the information I need by using this sort of =statement:
SELECT *, (SELECT SUPPLIERNAME FROM SUPPLIERS WHERE SUPPLIERNUMBER =3D ITEMS.LASTSUPPLIER) AS LASTSUPPLIERNAME, (SELECT SUPPLIERNAME FROM =SUPPLIERS WHERE SUPPLIERNUMBER =3D ITEMS.CURRENTSUPPLIER) AS CURRENTSUPPLIERNAME =FROM ITEMS
However this is not how I really want to do it... because I would like =to be able to something like:
as above... WHERE LASTSUPPLIERNAME LIKE '%MICROSOFT%'
however this doesn't work... 'error Invalid column name =LASTSUPPLIERNAME'
Could anyone help me with this please?
Thanks
Gav

---

--=_NextPart_000_001D_01C56854.400BBDA0--|||This is a multi-part message in MIME format.
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There's nothing wrong with the LIKE operator per se. It's just when you
you compare it to a string that begins with '%' (such as '%MICROSOFT%'),
which basically means this data could start with anything and so could
be anywhere in the index so I'd better scan the entire index so we find
all occurrences. Just make the search more specific.
--
*mike hodgson* |/ database administrator/ | mallesons stephen jaques
*T* +61 (2) 9296 3668 |* F* +61 (2) 9296 3885 |* M* +61 (408) 675 907
*E* mailto:mike.hodgson@.mallesons.nospam.com |* W* http://www.mallesons.com
Gav wrote:
> Thanks for the reply... however you say the 'LIKE' is not efficient,
> can you suggest a more efficient way to do this?
> Thanks again
> Gav
> "Mike Hodgson" <mike.hodgson@.mallesons.nospam.com
> <mailto:mike.hodgson@.mallesons.nospam.com>> wrote in message
> news:%23VzsIQ9ZFHA.2308@.TK2MSFTNGP14.phx.gbl...
> SELECT i.ITEMNUMBER, l.SUPPLIERNAME, c.SUPPLIERNAME
> FROM ITEMS as i
> INNER JOIN SUPPLIERS as l on l.SUPPLIERNUMBER = i.LASTSUPPLIER
> INNER JOIN SUPPLIERS as c on c.SUPPLIERNUMBER => i.CURRENTSUPPLIER
> WHERE l.SUPPLIERNAME LIKE '%MICROSOFT%'
>
> This is assuming you can't have a NULL LASTSUPPLIER or
> CURRENTSUPPLIER for a given ITEM row. If you can have nulls then
> you'd have to change the INNER joins to OUTER joins (left outer
> joins) so that you still get the ITEMNUMBER returned even if you
> have a NULL last supplier or current supplier. Also the "LIKE
> '%something%'" is not a fantastic search because it will require a
> complete index scan, ie. it will have to search every single row
> in the index from start to end, which is not terribly efficient.
> HTH
> --
> *mike hodgson* |/ database administrator/ | mallesons stephen jaques
> *T* +61 (2) 9296 3668 |* F* +61 (2) 9296 3885 |* M* +61 (408) 675 907
> *E* mailto:mike.hodgson@.mallesons.nospam.com |* W*
> http://www.mallesons.com
>
> Gav wrote:
>>Hi all,
>>I cannot quite get my head around these outer/inner joins (if this is what i
>>need).
>>Basically I have 2 tables ie
>>TABLE ITEMS
>>PRIMARYKEY ITEMNUMBER
>>FOREIGNKEY LASTSUPPLIER
>>FOREIGNKEY CURRENTSUPPLIER
>>TABLE SUPPLIERS
>>PRIMARYKEY SUPPLIERNUMBER
>>SUPPLIERNAME
>>Currently I can get the information I need by using this sort of statement:
>>SELECT *, (SELECT SUPPLIERNAME FROM SUPPLIERS WHERE SUPPLIERNUMBER =>>ITEMS.LASTSUPPLIER) AS LASTSUPPLIERNAME, (SELECT SUPPLIERNAME FROM SUPPLIERS
>>WHERE SUPPLIERNUMBER = ITEMS.CURRENTSUPPLIER) AS CURRENTSUPPLIERNAME FROM
>>ITEMS
>>However this is not how I really want to do it... because I would like to be
>>able to something like:
>>as above... WHERE LASTSUPPLIERNAME LIKE '%MICROSOFT%'
>>however this doesn't work... 'error Invalid column name LASTSUPPLIERNAME'
>>Could anyone help me with this please?
>>Thanks
>>Gav
>>
>>
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<tt>There's nothing wrong with the LIKE operator per se. It's just
when you you compare it to a string that begins with '%' (such as
'%MICROSOFT%'), which basically means this data could start with
anything and so could be anywhere in the index so I'd better scan the
entire index so we find all occurrences. Just make the search more
specific.</tt><br>
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<p><span lang="en-au"><font face="Tahoma" size="2">--<br>
</font> </span><b><span lang="en-au"><font face="Tahoma" size="2">mike
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Gav wrote:
<blockquote cite="miduaIEsjEaFHA.3384@.TK2MSFTNGP09.phx.gbl" type="cite">
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<div><font face="Arial" size="2">Thanks for the reply... however you
say the 'LIKE' is not efficient, can you suggest a more efficient way
to do this?</font></div>
<div> </div>
<div><font face="Arial" size="2">Thanks again</font></div>
<div><font face="Arial" size="2">Gav</font></div>
<blockquote
style="border-left: 2px solid rgb(0, 0, 0); padding-right: 0px; padding-left: 5px; margin-left: 5px; margin-right: 0px;"
dir="ltr">
<div>"Mike Hodgson" <<a
href="http://links.10026.com/?link=mailto:mike.hodgson@.mallesons.nospam.com">mike.hodgson@.mallesons.nospam.com</a>>
wrote in message <a href="http://links.10026.com/?link=news:%23VzsIQ9ZFHA.2308@.TK2MSFTNGP14.phx.gbl">news:%23VzsIQ9ZFHA.2308@.TK2MSFTNGP14.phx.gbl</a>...</div>
<blockquote><tt>SELECT i.ITEMNUMBER, l.SUPPLIERNAME, c.SUPPLIERNAME</tt><br>
<tt>FROM ITEMS as i</tt><br>
<tt> INNER JOIN SUPPLIERS as l on l.SUPPLIERNUMBER =i.LASTSUPPLIER</tt><br>
<tt> INNER JOIN SUPPLIERS as c on c.SUPPLIERNUMBER =i.CURRENTSUPPLIER</tt><br>
<tt>WHERE l.SUPPLIERNAME LIKE '%MICROSOFT%'</tt><br>
</blockquote>
<tt><br>
This is assuming you can't have a NULL LASTSUPPLIER or CURRENTSUPPLIER
for a given ITEM row. If you can have nulls then you'd have to change
the INNER joins to OUTER joins (left outer joins) so that you still get
the ITEMNUMBER returned even if you have a NULL last supplier or
current supplier. Also the "LIKE '%something%'" is not a fantastic
search because it will require a complete index scan, ie. it will have
to search every single row in the index from start to end, which is not
terribly efficient.<br>
<br>
HTH<br>
</tt>
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<p><span lang="en-au"><font face="Tahoma" size="2">--<br>
</font></span><b><span lang="en-au"><font face="Tahoma" size="2">mike
hodgson</font></span></b><span lang="en-au"> <font face="Tahoma"
size="2">|</font><i><font face="Tahoma"> </font><font face="Tahoma"
size="2">database administrator</font></i><font face="Tahoma" size="2">
| mallesons</font><font face="Tahoma"> </font><font face="Tahoma"
size="2">stephen</font><font face="Tahoma"> </font><font face="Tahoma"
size="2">jaques</font><font face="Tahoma"><br>
</font><b><font face="Tahoma" size="2">T</font></b><font
face="Tahoma" size="2"> +61 (2) 9296 3668 |</font><b><font
face="Tahoma"> </font><font face="Tahoma" size="2">F</font></b><font
face="Tahoma" size="2"> +61 (2) 9296 3885 |</font><b><font
face="Tahoma"> </font><font face="Tahoma" size="2">M</font></b><font
face="Tahoma" size="2"> +61 (408) 675 907</font><br>
<b><font face="Tahoma" size="2">E</font></b><font face="Tahoma"
size="2"> <a href="http://links.10026.com/?link=mailto:mike.hodgson@.mallesons.nospam.com">mailto:mike.hodgson@.mallesons.nospam.com</a>
|</font><b><font face="Tahoma"> </font><font face="Tahoma" size="2">W</font></b><font
face="Tahoma" size="2"> <a href="http://links.10026.com/?link=http://www.mallesons.com</a></font></span>">http://www.mallesons.com">http://www.mallesons.com</a></font></span>
</p>
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<br>
<br>
Gav wrote:
<blockquote cite="midu0PpRd8ZFHA.2520@.TK2MSFTNGP09.phx.gbl"
type="cite">
<pre wrap="">Hi all,
I cannot quite get my head around these outer/inner joins (if this is what i
need).
Basically I have 2 tables ie
TABLE ITEMS
PRIMARYKEY ITEMNUMBER
FOREIGNKEY LASTSUPPLIER
FOREIGNKEY CURRENTSUPPLIER
TABLE SUPPLIERS
PRIMARYKEY SUPPLIERNUMBER
SUPPLIERNAME
Currently I can get the information I need by using this sort of statement:
SELECT *, (SELECT SUPPLIERNAME FROM SUPPLIERS WHERE SUPPLIERNUMBER =ITEMS.LASTSUPPLIER) AS LASTSUPPLIERNAME, (SELECT SUPPLIERNAME FROM SUPPLIERS
WHERE SUPPLIERNUMBER = ITEMS.CURRENTSUPPLIER) AS CURRENTSUPPLIERNAME FROM
ITEMS
However this is not how I really want to do it... because I would like to be
able to something like:
as above... WHERE LASTSUPPLIERNAME LIKE '%MICROSOFT%'
however this doesn't work... 'error Invalid column name LASTSUPPLIERNAME'
Could anyone help me with this please?
Thanks
Gav
</pre>
</blockquote>
</blockquote>
</blockquote>
</body>
</html>
--040807050503000601030701--

Copying DBs

What is the Syntax for a statement that can copy one MS SQL DB to another Database (on a different server). Or is this even possible?See BOL (http://msdn.microsoft.com/library/default.asp?url=/library/en-us/adminsql/ad_bkprst_0ltf.asp).

-PatP|||BACKUP DATABASE
robocopy
RESTORE DATABASE

-or-

Detach database
robocopy
Attach database

-or-

Clone...lucky enough to have a SAN??

So, why don't you explain what you want to do this for. Then, we can give you a little better advice.|||What is the Syntax for a statement that can copy one MS SQL DB to another Database (on a different server). Or is this even possible?
It'd be easier for you to look into Database Wizards section.

Copying data from another DB on server problem

What iam trying to do is put the table name from one db into a variable and another one into another variable and pass them into my statement basicaly trying to bulk copy data from one table in a db and insert it into another db on the same server based on a condition

if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[ClientComment]')
and OBJECTPROPERTY(id, N'IsUserTable') = 1)

Declare @.BDFR varchar(20), @.BDTO varchar(20), @.EQID varchar(20)
set @.BDFR = 'Commander' + '.dbo.' + 'ClientComment'
set @.BDTO = 'Test_Commander' + '.dbo.' + 'ClientComment'
set @.EQID = '80_300_005'
insert into @.BDTO
select * from @.BDFR where Eqid = @.EQIDplz help .......|||You need to use dynamic SQL to do what you're envisioning.

Beware that dynamic SQL breaks most of the commonly accepted rules about security/permissions/etc because of the way that it works... The dynamic SQL is permission checked based on the user that is running the SQL.

With that said, I'd use something like:DECLARE @.BDFR varchar(20), @.BDTO varchar(20), @.EQID varchar(20)

SET @.BDFR = 'Commander' + '.dbo.' + 'ClientComment'
SET @.BDTO = 'Test_Commander' + '.dbo.' + 'ClientComment'
SET @.EQID = '80_300_005'

EXECUTE ('insert into ' + @.BDTO
+ ' select * from ' + @.BDFR + ' where Eqid = @.EQID')-PatP

Copy the table structures of all the tables

CREATE TABLE table_name AS SELECT STATEMENT WHERE rownum = 0;
this query will copy the table structure of one table without copying the data. I need to copy the table structures of all the tables in a particular database without copying the data.
suggest me on this.any body from microsoft|||gee I almost worked for microsoft. is that good enough?

in SQL2k, right click on your database in the Enterprise Mangler and choose Generate SQL script.|||rownum = 0?

What version are you talking about|||SQL Server 2000|||SQL Server 2000
Are you running this statement in sql server 2000? I don't think so...

CREATE TABLE table_name AS SELECT STATEMENT WHERE rownum = 0;

Please check your requirement,
That will not work at all,but this will

SELECT TOP 0 * INTO NewTable FROM OldTable

well Thrasymachus has already given you the solution.|||You can try an app I wrote for this called scriptdb. It will create scripts for ALL objects, not just tables, a separate file for each.

the source is freely available so you can modify it to suit your needs if you know C#.

get it here: http://www.elsasoft.org/tools.htm

EDIT: and I used to be a dev on the ms sql team, but no longer. does that count? :)

Copy Table

I would like to make a copy of an existing table. We can
use the following statement:
SELECT * INTO new_table from old_table
However, someone says that the constraint and indexes are
not copied across.
If I copy the table with DTS, does it copy both
constraints and indexes ?
ThanksDTS will not create the indexes either.
You will need to script the copy and create new indexes.
Immy
"Peter" <anonymous@.discussions.microsoft.com> wrote in message
news:04f501c46e27$1a640940$a301280a@.phx.gbl...
> I would like to make a copy of an existing table. We can
> use the following statement:
> SELECT * INTO new_table from old_table
>
> However, someone says that the constraint and indexes are
> not copied across.
>
> If I copy the table with DTS, does it copy both
> constraints and indexes ?
>
> Thanks|||Hi,
SELECT * INTO , DTS will not copy the dependant objects. The only solution
is to create the scripts using "Generate SQL Script" using Enterprise
manager by selecting all dependant objects. AFter generating the script
change the object names and execute in Query Analyzer. After the object
creation use
INSERT into new_table_name select * from existing_table
Thanks
Hari
MCDBA
"Peter" <anonymous@.discussions.microsoft.com> wrote in message
news:04f501c46e27$1a640940$a301280a@.phx.gbl...
> I would like to make a copy of an existing table. We can
> use the following statement:
> SELECT * INTO new_table from old_table
> However, someone says that the constraint and indexes are
> not copied across.
> If I copy the table with DTS, does it copy both
> constraints and indexes ?
> Thanks