Question

What is the correct way to do this? For example, how would I change a stored procedure with this signature:

CREATE PROCEDURE dbo.MyProcedure   @Param BIT = NULL AS   SELECT *   FROM dbo.SomeTable T   WHERE T.SomeColumn = @Param 

So that giving @Param with a value of 1 or 0 performs the filter, but not specifying it or passing NULL performs no filtering?

Answer 1

Assuming that NULL means ‘don’t care’ then use

CREATE PROCEDURE dbo.MyProcedure     @Param BIT = NULL AS    SELECT *    FROM dbo.SomeTable T    WHERE T.SomeColumn = @Param OR @Param IS NULL