Hi All,
I'd like to know if there is a better way of producing my result set rather than using the below union:
CREATE TABLE #t1
(PKT1 INT IDENTITY (10,1),
ID INT,
ID2 INT)
CREATE TABLE #t2
(PKT2 INT IDENTITY (20,1),
ID INT,
ID2 INT)
INSERT #t1
( ID, ID2 )
SELECT 18185, NULL UNION ALL
SELECT 18165, 39875 UNION ALL
SELECT NULL, 39875 UNION ALL
SELECT NULL, 39875 UNION ALL
SELECT 18189, NULL UNION ALL
SELECT NULL, 40001 UNION ALL
SELECT 18163, NULL UNION ALL
SELECT 18495, 40011
INSERT #t2
( ID, ID2 )
SELECT 18185, NULL UNION ALL
SELECT NULL, 39875 UNION ALL
SELECT 18189, 63751 UNION ALL
SELECT 18495, 40011
SELECT * FROM #t1
SELECT * FROM #t2
SELECT *
FROM #t1
INNER JOIN #t2 ON #t1.ID = #t2.ID
WHERE #t2.ID2 IS NULL
UNION ALL
SELECT *
FROM #t1
INNER JOIN #t2 ON #t1.ID2 = #t2.ID2
WHERE #t2.ID IS NULL
UNION ALL
SELECT *
FROM #t1
INNER JOIN #t2 ON #t1.ID = #t2.ID AND #t1.ID2 = #t2.ID2
I need to join ID1 and ID2 to t2 only when one of them exists in t2, then when both ID1 and ID2 exist in t2.
Thanks in advance