MySQL 内建函数

日期相关

mysql> select curdate(),curtime(),now(),unix_timestamp(),week(‘2017-07-24‘),year(‘2017-07-24‘),hour(‘16:15:11‘),date_format(‘2017-07-24‘,‘%m-%d,%y‘);
+------------+-----------+---------------------+------------------+--------------------+--------------------+------------------+--------------------------------------+
| curdate()  | curtime() | now()               | unix_timestamp() | week(‘2017-07-24‘) | year(‘2017-07-24‘) | hour(‘16:15:11‘) | date_format(‘2017-07-24‘,‘%m-%d,%y‘) |
+------------+-----------+---------------------+------------------+--------------------+--------------------+------------------+--------------------------------------+
| 2017-07-24 | 16:18:37  | 2017-07-24 16:18:37 |       1500884317 |                 30 |               2017 |               16 | 07-24,17                             |
+------------+-----------+---------------------+------------------+--------------------+--------------------+------------------+--------------------------------------+
1 row in set (0.00 sec)

其他常用

mysql> select database(),version(),user(),inet_aton(‘118.11.22.33‘),password(‘1‘),md5(‘1‘);
+------------+------------+----------------+---------------------------+-------------------------------------------+----------------------------------+
| database() | version()  | user()         | inet_aton(‘118.11.22.33‘) | password(‘1‘)                             | md5(‘1‘)                         |
+------------+------------+----------------+---------------------------+-------------------------------------------+----------------------------------+
| NULL       | 5.6.34-log | root@localhost |                1980438049 | *E6CC90B878B948C35E92B003C792C46C58C4AF40 | c4ca4238a0b923820dcc509a6f75849b |
+------------+------------+----------------+---------------------------+-------------------------------------------+----------------------------------+
1 row in set (0.00 sec)