查询数据表的全部内容

mysql> show tables;#查看当前数据库下的全部表+--------------------+| Tables_in_ceshi_ku |+--------------------+| biao               || ceshi_biao         |+--------------------+2 rows in set (0.00 sec)mysql> select * from biao;#查看该表全部的内容。*代表通配符。在这里是代表全部的列+------+-----------+--------+----------+--------+| id   | name      | gender | gongsi   | gongzi |+------+-----------+--------+----------+--------+|    1 | ma yun    | n      | tao bao  | 6000.5 ||    2 | xiao hong | v      | xin lang | 5000.7 ||    3 | xiao ming | n      | bai du   | 3000.4 ||    4 | li si     | n      | sou hu   | 9000.2 ||    5 | lao wang  | NULL   | wang yi  | 1000.5 ||    6 | xiao li   | NULL   | ku gou   |  700.1 |+------+-----------+--------+----------+--------+6 rows in set (0.00 sec)

查询数据表的全部列、部分行

mysql> select * from biao where id>4;#查询全部列，部分行，即id大于4的行+------+----------+--------+---------+--------+| id   | name     | gender | gongsi  | gongzi |+------+----------+--------+---------+--------+|    5 | lao wang | NULL   | wang yi | 1000.5 ||    6 | xiao li  | NULL   | ku gou  |  700.1 |+------+----------+--------+---------+--------+2 rows in set (0.02 sec)

查询数据表的部分列、全部行

mysql> select name,gongzi from biao;#查询部分列，即"name"和"gongzi"列，之间用","隔开。选择全部行+-----------+--------+| name      | gongzi |+-----------+--------+| ma yun    | 6000.5 || xiao hong | 5000.7 || xiao ming | 3000.4 || li si     | 9000.2 || lao wang  | 1000.5 || xiao li   |  700.1 |+-----------+--------+6 rows in set (0.02 sec)

查询数据表的部分列、部分行

mysql> select name from biao where gongzi>3000;#选择部分列，即"name"列。也能够多个列。然后选择工资>3000的行+-----------+| name      |+-----------+| ma yun    || xiao hong || xiao ming || li si     |+-----------+4 rows in set (0.00 sec)