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DECLARE @b INT
SELECT @b = ISNULL(b,0) FROM #a WHERE a=2
IF @@ROWCOUNT = 0
SELECT @b = 0
SELECT @b AS b
DECLARE @a INT
DECLARE @b INT
SET @a = NULL
SET @b = NULL
IF @a = @b
PRINT 'NULL = NULL'
ELSE
PRINT 'NULL <> NULL'