The range of the return value is 0 to 23.
The range of TIME values could be much larger.
mysql>mysql> SELECT HOUR('10:05:03');+------------------+| HOUR('10:05:03') |+------------------+| 10 |+------------------+1 row in set (0.00 sec)mysql>mysql> SELECT HOUR('272:59:59');+-------------------+| HOUR('272:59:59') |+-------------------+| 272 |+-------------------+1 row in set (0.00 sec)
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