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How to created User Functions in T-SQL to include in main select statement, if possible?

Posted on 2011-03-04
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Last Modified: 2012-05-11
Hi,

I need to use a subselect in a select statement, ie

select ID, (select name from.... where ID1 = @ID1 and ID2 = @ID2) as Name from  .....

Now this subselect has got more complicated so rather recopy this sql all over the place I was wondering whether it was possible to just create a User Function/Stored Function/Stored Procedure instead and if possible how to do it. So instead I would hope to:

select ID, (GetName(@ID1,@ID2) as Name from  ...

So my question is really about is GetName possible and how to do it?

Thanks,

Sam..
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Question by:SamJolly
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5 Comments
 
LVL 143

Accepted Solution

by:
Guy Hengel [angelIII / a3] earned 2000 total points
ID: 35035023
yes, that is perfectly possible

create function dbo.GetName(@id1 int, @id2 int) returns varchar(100)
as return ( select name from.... where ID1 = @ID1 and ID2 = @ID2 ) 

Open in new window


and use it:
select ID, dbo.GetName(ID1, ID2) as Name 
from  ..... 

Open in new window


note: the dbo (schema) prefix owner is important

0
 

Author Comment

by:SamJolly
ID: 35035156
Thanks for this. COuld I trouble you for some more detail. My code iverview so far is :

create function dbo.GetDefinitionName(@FkDefinitionID UNIQUEIDENTIFIER, @ClientID UNIQUEIDENTIFIER) returns varchar(50)
as return
(
SELECT ISNULL
(
(
SELECT Name
FROM .... etc
),
NULL
)
)

I am getting "Incorrect syntax near 'RETURN'." Something stupid I am sure.

Thanks again.

Sam
0
 

Author Comment

by:SamJolly
ID: 35035235
Nearest I have got and working I think is:

 
create function dbo.GetDefinitionName(@FkDefinitionID UNIQUEIDENTIFIER, @ClientID UNIQUEIDENTIFIER) returns varchar(50)
as 
BEGIN
DECLARE @DefinitionName varchar(50)

SET @DefinitionName =
(
SELECT ISNULL
(
( 
SELECT Name 
FROM ....etc...),
NULL
) 
) 

RETURN @DefinitionName

END

Open in new window



Is this what you mean?

0
 
LVL 143

Expert Comment

by:Guy Hengel [angelIII / a3]
ID: 35035347
yes, that is fine. what I posted was not double-checked, and indeed would be a table-valued function, you want a single value to be returned.
0
 

Author Closing Comment

by:SamJolly
ID: 35035465
thanks. Much appreciated.
0

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