Logical XOR operator in T-SQL (SQL Server 2000)

Question

Hi all....
I was wondering why SQL Server 2000 lacks a logical XOR operator. Do you have a ready to use function that implements it?
How can I program one by myself? I know that A XOR B is equivalent to NOT A * B + A * NOT B. So I tried to create this function :
CREATE FUNCTION XOR
-- Add the parameters for the function here
@A BIT,
@B BIT
RETURNS BIT
AS
BEGIN
RETURN NOT @A AND @B OR @A + NOT @B
END
But it didn't compile.
How can I pass boolean values as parameters? any other hint?
Thanks
Jaime

Answer 1

I have these two views , one of them hard coded as NULL as it always needs to be NULL. I wanted to union them
Now the problem is I have to replace those NULLS if I have a value from other VIEW or else NULL ( no change)
I am getting duplicates of rows with values and NULLS , whereas I needed only records with values
I need records with values and records without value as NULL . please let me know how to eliminate dups with NULLS
21
ARGH
Bus    
NULL
NULL
NULL
NULL
21
ARGH
Bus
66
781
HEAVY
00:00.0
21
F1WS
Ship
NULL
NULL
NULL
NULL
21
HGDD
car
NULL
NULL
NULL
NULL
21
HGDT
car
NULL
NULL
NULL
NULL
Below is the code :
--- view having values
SELECT *
FROM Table1 AS S INNER JOIN
Table2 AS P ON S.columnA = P.columnB
WHERE EXISTS
(SELECT 1 AS A
FROM Table2 AS R
WHERE (S.columnA = columnB))
GROUP BY ALL
UNION
--- views harded coded as NULLS
SELECT *, NULL AS APR , NULL AS MAY , NULL AS JUN , NULL AS JUL , NULL AS AUG
FROM Table1 AS S INNER JOIN
Table2 AS P ON S.columnA <> P.columnB
WHERE (NOT EXISTS
(SELECT 1 AS A
FROM Table2 AS R
WHERE (S.columnA = columnB) )) OR
EXISTS
(SELECT 1 AS A
FROM Table2 AS R
WHERE (S.columnA = columnB) )
GROUP BY ALL