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WITH yourTable AS ( SELECT 1 AS ID, 'X' AS val_a, 'T' AS val_b UNION ALL SELECT 2, 'X', 'U' UNION ALL SELECT 3, 'X', NULL UNION ALL SELECT 4, 'X', NULL UNION ALL SELECT 5, 'Y', NULL ), cte AS ( SELECT ID, val_a, val_b, COUNT(CASE WHEN val_a = 'X' AND val_b = 'V' THEN 1 END) OVER () cnt FROM yourTable ) SELECT ID, val_a, val_b FROM cte WHERE val_a = 'X' AND (val_b = 'V' OR (val_b IS NULL AND cnt = 0));
ID
val_a
val_b
3
X
null
4
X
null