mysql學習二(常用函式)
阿新 • • 發佈:2018-11-16
- 字串函式
mysql> select concat('aaa','bbb','ccc'); +---------------------------+ | concat('aaa','bbb','ccc') | +---------------------------+ | aaabbbccc | +---------------------------+ 1 row in set (0.02 sec) mysql> select insert('beijng2008you',12,3,'me'); +-----------------------------------+ | insert('beijng2008you',12,3,'me') | +-----------------------------------+ | beijng2008yme | +-----------------------------------+ 1 row in set (0.00 sec)
- 數值函式
mysql> SELECT MOD(15,10),MOD(1,11),MOD(null,10); +------------+-----------+--------------+ | MOD(15,10) | MOD(1,11) | MOD(null,10) | +------------+-----------+--------------+ | 5 | 1 | NULL | +------------+-----------+--------------+ 1 row in set (0.01 sec) mysql> select rand(),rand(); +---------------------+--------------------+ | rand() | rand() | +---------------------+--------------------+ | 0.08019654553401893 | 0.8553781629124453 | +---------------------+--------------------+ 1 row in set (0.01 sec)
- 日期和時間函式
mysql> select curdate(); +------------+ | curdate() | +------------+ | 2018-09-11 | +------------+ 1 row in set (0.00 sec) mysql> select curtime(); +-----------+ | curtime() | +-----------+ | 11:11:12 | +-----------+ 1 row in set (0.00 sec) mysql> select now(); +---------------------+ | now() | +---------------------+ | 2018-09-11 11:11:21 | +---------------------+ 1 row in set (0.00 sec)
- 流程函式
- 其他常用函式