mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-11-13 11:04:10 +00:00
17 lines
654 B
MySQL
17 lines
654 B
MySQL
|
DROP TABLE IF EXISTS test.nullable_alter;
|
||
|
|
CREATE TABLE test.nullable_alter (d Date DEFAULT '2000-01-01', x String) ENGINE = MergeTree(d, d, 1);
|
||
|
|
|
||
|
|
INSERT INTO test.nullable_alter (x) VALUES ('Hello'), ('World');
|
||
|
|
SELECT x FROM test.nullable_alter ORDER BY x;
|
||
|
|
|
||
|
|
ALTER TABLE test.nullable_alter MODIFY COLUMN x Nullable(String);
|
||
|
|
SELECT x FROM test.nullable_alter ORDER BY x;
|
||
|
|
|
||
|
|
INSERT INTO test.nullable_alter (x) VALUES ('xyz'), (NULL);
|
||
|
|
SELECT x FROM test.nullable_alter ORDER BY x NULLS FIRST;
|
||
|
|
|
||
|
|
ALTER TABLE test.nullable_alter MODIFY COLUMN x Nullable(FixedString(5));
|
||
|
|
SELECT x FROM test.nullable_alter ORDER BY x NULLS FIRST;
|
||
|
|
|
||
|
|
DROP TABLE test.nullable_alter;
|