Can I have an optional OUTPUT parameter in a stored procedure?

Question

I have a stored procedure that has a bunch of input and output parameters because it is Inserting values to multiple tables. In some cases the stored proc only inserts to a

Answer 1

Both input and output parameters can be assigned defaults. In this example:

CREATE PROCEDURE MyTest
  @Data1 int
 ,@Data2 int = 0
 ,@Data3 int = null output

AS

PRINT @Data1
PRINT @Data2
PRINT isnull(@Data3, -1)

SET @Data3 = @Data3 + 1

RETURN 0

the first paramter is required, and the second and third are optional--if not set by the calling routine, they will be assigned the default values. Try messing around with it and the following test-call routine in SSMS using different values and settings to see how it all works together.

DECLARE @Output int

SET @Output = 3

EXECUTE MyTest
  @Data1 = 1
 ,@Data2 = 2
 ,@Data3 = @Output output

PRINT '---------'
PRINT @Output