HOUR()

Description

Returns the hour for time. The range of the return value is 0 to 23 for time-of-day values. However, the range of TIME values actually is much larger, so HOUR can return values greater than 23. Returns NULL if time is NULL.

Syntax

> HOUR(time)

Arguments

Arguments	Description
time	Required. A value that represents time or timestamp.

Examples

```sql drop table if exists t1; create table t1(a datetime, b timestamp); insert into t1 values("2022-07-01", "2011-01-31 12:00:00"); insert into t1 values("2011-01-31 12:32:11", "1979-10-22"); insert into t1 values(NULL, "2022-08-01 23:10:11"); insert into t1 values("2011-01-31", NULL); insert into t1 values("2022-06-01 14:11:09","2022-07-01 00:00:00"); insert into t1 values("2022-12-31","2011-01-31 12:00:00"); insert into t1 values("2022-06-12","2022-07-01 00:00:00");

mysql> select hour(a),hour(b) from t1; +---------+---------+ | hour(a) | hour(b) | +---------+---------+ | 0 | 12 | | 12 | 0 | | NULL | 23 | | 0 | NULL | | 14 | 0 | | 0 | 12 | | 0 | 0 | +---------+---------+ 7 rows in set (0.00 sec)

mysql> select * from t1 where hour(a)>hour(b); +---------------------+---------------------+ | a | b | +---------------------+---------------------+ | 2011-01-31 12:32:11 | 1979-10-22 00:00:00 | | 2022-06-01 14:11:09 | 2022-07-01 00:00:00 | +---------------------+---------------------+ 2 rows in set (0.01 sec) ```