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Default parameter in SQL function

Posted on 2008-06-17
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Last Modified: 2008-11-04
I have been tasked to create a report that compares the sum of values from the previous year, the current month and ytd in three columns.  In my first stab at it, I created a ytd function and a monthly function.  I'd like to refine this by creating one function that uses an either default parameter that I either won't use or an optional parameter.  Something like

CREATE FUNCTION dbo.TESTFUNCTION(@PERIOD INT, @YEAR INT, @MONTH INT) <<< I would like @MONTH to be optional.  If @PERIOD = 1 then I'm going for a yearly total and I don't need the month.
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Question by:AaronGreene1906
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Expert Comment

by:chapmandew
ID: 21803123
CREATE FUNCTION dbo.TESTFUNCTION(@PERIOD INT, @YEAR INT, @MONTH INT = 0)
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Author Comment

by:AaronGreene1906
ID: 21806505
This is what I have now, but I'm having trouble with the IF...THEN statement.

CREATE FUNCTION dbo.HOURS(@YEAR INT,@MONTH INT = 0)
RETURNS REAL
AS
BEGIN
DECLARE @RESULT REAL
IF @MONTH = 0 THEN
SELECT @RESULT = ISNULL(SUM(X.HOURS),0)
FROM
(SELECT     DATEPART(Yy, dbo.tblWorkOrder.txtWORKSTARTDATE) AS YEAR, DATEPART(Mm, dbo.tblWorkOrder.txtWORKSTARTDATE) AS MONTH,
                      dbo.tblWorkOrder.cboBUNIT AS UNIT, dbo.tblWorkOrder_Labor.intLABOR_CODE AS PAYTYPE, dbo.tblWorkOrder_Labor.txtHOURS AS HOURS
FROM         dbo.tblWorkOrder INNER JOIN
                      dbo.tblWorkOrder_Labor ON dbo.tblWorkOrder.txtWORKORDER = dbo.tblWorkOrder_Labor.txtWORKORDER INNER JOIN
                      dbo.tblData_Employee ON dbo.tblWorkOrder_Labor.txtEMPLOYEEID = dbo.tblData_Employee.txtEMPLOYEEID) X
WHERE
X.YEAR = @YEAR
ELSE
SELECT @RESULT = ISNULL(SUM(X.HOURS),0)
FROM
(SELECT     DATEPART(Yy, dbo.tblWorkOrder.txtWORKSTARTDATE) AS YEAR, DATEPART(Mm, dbo.tblWorkOrder.txtWORKSTARTDATE) AS MONTH,
                      dbo.tblWorkOrder.cboBUNIT AS UNIT, dbo.tblWorkOrder_Labor.intLABOR_CODE AS PAYTYPE, dbo.tblWorkOrder_Labor.txtHOURS AS HOURS
FROM         dbo.tblWorkOrder INNER JOIN
                      dbo.tblWorkOrder_Labor ON dbo.tblWorkOrder.txtWORKORDER = dbo.tblWorkOrder_Labor.txtWORKORDER INNER JOIN
                      dbo.tblData_Employee ON dbo.tblWorkOrder_Labor.txtEMPLOYEEID = dbo.tblData_Employee.txtEMPLOYEEID) X
WHERE X.YEAR = @YEAR
AND X.MONTH = @MONTH
RETURN @RESULT
END
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Accepted Solution

by:
chapmandew earned 500 total points
ID: 21806542
You don't need THEN in TSQL:
CREATE FUNCTION dbo.HOURS(@YEAR INT,@MONTH INT = 0)

RETURNS REAL

AS

BEGIN

DECLARE @RESULT REAL

IF @MONTH = 0 

BEGIN

SELECT @RESULT = ISNULL(SUM(X.HOURS),0)

FROM

(SELECT     DATEPART(Yy, dbo.tblWorkOrder.txtWORKSTARTDATE) AS YEAR, DATEPART(Mm, dbo.tblWorkOrder.txtWORKSTARTDATE) AS MONTH,

                      dbo.tblWorkOrder.cboBUNIT AS UNIT, dbo.tblWorkOrder_Labor.intLABOR_CODE AS PAYTYPE, dbo.tblWorkOrder_Labor.txtHOURS AS HOURS

FROM         dbo.tblWorkOrder INNER JOIN

                      dbo.tblWorkOrder_Labor ON dbo.tblWorkOrder.txtWORKORDER = dbo.tblWorkOrder_Labor.txtWORKORDER INNER JOIN

                      dbo.tblData_Employee ON dbo.tblWorkOrder_Labor.txtEMPLOYEEID = dbo.tblData_Employee.txtEMPLOYEEID) X

WHERE

X.YEAR = @YEAR

END

ELSE

BEGIN

SELECT @RESULT = ISNULL(SUM(X.HOURS),0)

FROM

(SELECT     DATEPART(Yy, dbo.tblWorkOrder.txtWORKSTARTDATE) AS YEAR, DATEPART(Mm, dbo.tblWorkOrder.txtWORKSTARTDATE) AS MONTH,

                      dbo.tblWorkOrder.cboBUNIT AS UNIT, dbo.tblWorkOrder_Labor.intLABOR_CODE AS PAYTYPE, dbo.tblWorkOrder_Labor.txtHOURS AS HOURS

FROM         dbo.tblWorkOrder INNER JOIN

                      dbo.tblWorkOrder_Labor ON dbo.tblWorkOrder.txtWORKORDER = dbo.tblWorkOrder_Labor.txtWORKORDER INNER JOIN

                      dbo.tblData_Employee ON dbo.tblWorkOrder_Labor.txtEMPLOYEEID = dbo.tblData_Employee.txtEMPLOYEEID) X

WHERE X.YEAR = @YEAR

AND X.MONTH = @MONTH

END

RETURN @RESULT

END

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