The below is what I have used in the past to accomplish the need for a Scalar UDF in MS SQL:

IF OBJECT_ID('tempdb..##fn_CORP_Divide') IS NOT NULL DROP PROCEDURE ##fn_CORP_Divide;

CREATE PROCEDURE ##fn_CORP_Divide (@Numerator Real, @Denominator Real) AS

BEGIN

SELECT Division =

CASE WHEN @Denominator != 0 AND @Denominator is NOT NULL AND @Numerator != 0 AND @Numerator is NOT NULL THEN

@Numerator / @Denominator

ELSE

0

END

RETURN

END;

EXEC ##fn_CORP_Divide 6,4

This approach which uses a global variable for the PROCEDURE allows you to make use of the function not only in your scripts, but also in your Dynamic SQL needs.