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Edit
hour
description
Syntax
INT HOUR(DATETIME date)It returns the hour for a given date. The return values range from 0 to 23.
The parameter is in Date or Datetime type.
example
MySQL > select hour('2018-12-31 23:59:59');
+-----------------------------+
| hour('2018-12-31 23:59:59') |
+-----------------------------+
| 23 |
+-----------------------------+keyword
HOUR