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SELECT * FROM (VALUES (0, 0), (0, 1), (1, 0), (1, 1), (0, NULL), (1, NULL), (NULL, 0), (NULL, 1), (NULL, NULL) ) v (x, y) WHERE x is distinct from y
x
y
0
1
1
0
0
null
1
null
null
0
null
1
SELECT 6