SELECT 0 OR NULL, 1 OR NULL, toNullable(0) OR NULL, toNullable(1) OR NULL, 0.0 OR NULL, 0.1 OR NULL, NULL OR 1 OR NULL, 0 OR NULL OR 1 OR NULL; SELECT 0 AND NULL, 1 AND NULL, toNullable(0) AND NULL, toNullable(1) AND NULL, 0.0 AND NULL, 0.1 AND NULL, NULL AND 1 AND NULL, 0 AND NULL AND 1 AND NULL; SELECT x, 0 OR x, 1 OR x, x OR x, toNullable(0) OR x, toNullable(1) OR x, 0.0 OR x, 0.1 OR x, x OR 1 OR x, 0 OR x OR 1 OR x FROM (SELECT number % 2 ? number % 3 : NULL AS x FROM system.numbers LIMIT 10); SELECT x, 0 AND x, 1 AND x, x AND x, toNullable(0) AND x, toNullable(1) AND x, 0.0 AND x, 0.1 AND x, x AND 1 AND x, 0 AND x AND 1 AND x FROM (SELECT number % 2 ? number % 3 : NULL AS x FROM system.numbers LIMIT 10); DROP TABLE IF EXISTS test; CREATE TABLE test ( x Nullable(Int32) ) ENGINE = Log; INSERT INTO test VALUES(1), (0), (null); SELECT * FROM test; SELECT x FROM test WHERE x != 0; SELECT x FROM test WHERE x != 0 OR isNull(x); SELECT x FROM test WHERE x != 1; DROP TABLE test;