SQL语句及5.7.2 mysql 用户管理

一、用户的定义

1.1 用户名+主机域

此处为5.7.2版本的mysql当中password字段已改为authentication_string
mysql> select user,host,authentication_string from user;

+---------------+-----------+-------------------------------------------+
| user          | host      | authentication_string                     |
+---------------+-----------+-------------------------------------------+
| root          | localhost | *5B11E7BC48365F1019E05077EBDC42BA908B3342 |
| mysql.session | localhost | *THISISNOTAVALIDPASSWORDTHATCANBEUSEDHERE |
| mysql.sys     | localhost | *THISISNOTAVALIDPASSWORDTHATCANBEUSEDHERE |
| shiqi         | %         | *5B11E7BC48365F1019E05077EBDC42BA908B3342 |
| shiqi         | localhost | *5B11E7BC48365F1019E05077EBDC42BA908B3342 |
+---------------+-----------+-------------------------------------------+
5 rows in set (0.02 sec)

1.2 用户作用

1.登录数据库
登录命令为：`mysql -u username -p` 然后输入密码
2.管理数据库和维护数据