HOUR

描述

获得日期时间中的小时的信息。

语法

HOUR(<dt>)

参数

参数	说明
`<dt>`	需要计算的日期

返回值

返回日期中的小时的信息。返回值范围从 0-23。当参数为 Time，返回值可以大于 24

举例

select hour('2018-12-31 23:59:59');

+-----------------------------+
| hour('2018-12-31 23:59:59') |
+-----------------------------+
|                          23 |
+-----------------------------+

select cast(4562632 as time),hour(cast(4562632 as time)), minute(cast(4562632 as time)),second(cast(4562632 as time));

+-----------------------+-----------------------------+-------------------------------+-------------------------------+
| cast(4562632 as TIME) | hour(cast(4562632 as TIME)) | minute(cast(4562632 as TIME)) | second(cast(4562632 as TIME)) |
+-----------------------+-----------------------------+-------------------------------+-------------------------------+
| 456:26:32             |                         456 |                            26 |                            32 |
+-----------------------+-----------------------------+-------------------------------+-------------------------------+

HOUR_FLOOR HOURS_ADD