mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-11-30 03:22:14 +00:00
62 lines
1.1 KiB
SQL
62 lines
1.1 KiB
SQL
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;
|