1.查询所有 * select * from table_name; 2.查询指定的列 mysql> select myname from zhuzhu; +--------+ | myname | +--------+ | zhang3 | | li4 | | zhang3 | | li4 | | zhang3 | | li4 | | zhang3 | | li4 | | zhang3 | | li4 | | zhang3 | | li4 | | zhang3 | | li4 | | zhang3 | | li4 | +--------+ 16 rows in set (0.00 sec) 3.去重--distinct mysql> select distinct myname from zhuzhu; +--------+ | myname | +--------+ | zhang3 | | li4 | +--------+ 2 rows in set (0.00 sec) 4.排序--order by mysql> select * from zhu; +------+--------+------+ | id | myname | age | +------+--------+------+ | 1 | zhang3 | 18 | | 2 | li4 | 20 | | 3 | wang5 | 15 | +------+--------+------+ 3 rows in set (0.00 sec) mysql> select * from zhu order by age; +------+--------+------+ | id | myname | age | +------+--------+------+ | 3 | wang5 | 15 | | 1 | zhang3 | 18 | | 2 | li4 | 20 | +------+--------+------+ 3 rows in set (0.00 sec) mysql> select * from zhu order by age desc; +------+--------+------+ | id | myname | age | +------+--------+------+ | 2 | li4 | 20 | | 1 | zhang3 | 18 | | 3 | wang5 | 15 | +------+--------+------+ 3 rows in set (0.00 sec) 5.限制显示-limit mysql> select * from zhu limit 1; +------+--------+------+ | id | myname | age | +------+--------+------+ | 1 | zhang3 | 18 | +------+--------+------+ 1 row in set (0.00 sec) mysql> select * from zhu limit 1,2; +------+--------+------+ | id | myname | age | +------+--------+------+ | 2 | li4 | 20 | | 3 | wang5 | 15 | +------+--------+------+ 2 rows in set (0.01 sec)
时间: 2024-07-29 23:06:12