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Function that finds a value in a table

Posted on 2011-09-16
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Last Modified: 2012-06-27
I need a function that will return true in the passed value is in a table.  For example:
StationCode      Site
100      Site1
200      Site2
300      Site3
400      Site4

Passing  a value of 100 would return 1 or true
Passing a value of 150 would return 0 or false
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Question by:vincem1099
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4 Comments
 
LVL 11

Accepted Solution

by:
indianguru2 earned 500 total points
ID: 36552176
Try this:

CREATE FUNCTION Function_CheckIfStationCodeExists ( @StationCode INT )
RETURNS BIT
AS
    BEGIN
        IF EXISTS ( SELECT  1
                    FROM    tableName --- Enter you table Name here
                    WHERE   StationCode = @StationCode )
            RETURN CAST(1 AS BIT)
        ELSE
            RETURN CAST(0 AS BIT)
           
    END

GO
0
 
LVL 7

Author Comment

by:vincem1099
ID: 36552227
I get the following error message when trying to execute the code:
Msg 455, Level 16, State 2, Procedure udf_LookupSite, Line 20
The last statement included within a function must be a return statement.
0
 
LVL 7

Author Comment

by:vincem1099
ID: 36552254
This modification works though
CREATE FUNCTION dbo.udf_LookupSite
(
	
	@StationCode int
)
RETURNS bit
AS
BEGIN
	DECLARE @RETURNVALUE BIT
	IF EXISTS ( SELECT  1
                FROM    vSites 
                WHERE   StationCode = @StationCode ) 
        set @RETURNVALUE = CAST(1 AS BIT)
    ELSE 
        set @RETURNVALUE = CAST(0 AS BIT)
        
	
	RETURN @RETURNVALUE

END

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0
 
LVL 7

Author Closing Comment

by:vincem1099
ID: 36552315
Thanks for pointing me in the right direction
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