mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-11-22 23:52:03 +00:00
19 lines
646 B
SQL
19 lines
646 B
SQL
DROP TABLE IF EXISTS nullable_alter;
|
|
|
|
set allow_deprecated_syntax_for_merge_tree=1;
|
|
CREATE TABLE nullable_alter (d Date DEFAULT '2000-01-01', x String) ENGINE = MergeTree(d, d, 1);
|
|
|
|
INSERT INTO nullable_alter (x) VALUES ('Hello'), ('World');
|
|
SELECT x FROM nullable_alter ORDER BY x;
|
|
|
|
ALTER TABLE nullable_alter MODIFY COLUMN x Nullable(String);
|
|
SELECT x FROM nullable_alter ORDER BY x;
|
|
|
|
INSERT INTO nullable_alter (x) VALUES ('xyz'), (NULL);
|
|
SELECT x FROM nullable_alter ORDER BY x NULLS FIRST;
|
|
|
|
ALTER TABLE nullable_alter MODIFY COLUMN x Nullable(FixedString(5));
|
|
SELECT x FROM nullable_alter ORDER BY x NULLS FIRST;
|
|
|
|
DROP TABLE nullable_alter;
|