Mysql datetime取日期day,取每月最后一天,取每月天数
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mysql> select day('2020-01-01 18:10:10')
-> ;
+----------------------------+
| day('2020-01-01 18:10:10') |
+----------------------------+
| 1 |
+----------------------------+
1 row in set (0.00 sec)
mysql> select day('2020-01-21 18:10:10')
-> ;
+----------------------------+
| day('2020-01-21 18:10:10') |
+----------------------------+
| 21 |
+----------------------------+
1 row in set (0.00 sec)
mysql> select day('2020-10-21 18:10:10')
-> ;
+----------------------------+
| day('2020-10-21 18:10:10') |
+----------------------------+
| 21 |
+----------------------------+
1 row in set (0.00 sec)
mysql> select last_day('2021-01-01 12:12:01');
+---------------------------------+
| last_day('2021-01-01 12:12:01') |
+---------------------------------+
| 2021-01-31 |
+---------------------------------+
1 row in set (0.00 sec)
mysql> ;
ERROR:
No query specified
mysql> select last_day('2021-09-01 12:12:01');
+---------------------------------+
| last_day('2021-09-01 12:12:01') |
+---------------------------------+
| 2021-09-30 |
+---------------------------------+
1 row in set (0.00 sec)
mysql>
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