mysql中给一个用户授权如select，insert，update，delete等其中的一个或者多个权限，主要使用grant命令，格式为：

给没有用户授权

grant 权限 on 数据库对象 to '用户'@'主机IP' identified by '密码';

给已经存在的用户授权

grant 权限 on 数据库对象 to '用户'@'主机IP';

一、grant普通用户，查询，插入，更新，删除数据库中的所有表的权利。

1、授予查看权限

mysql> grant select on mysql.user to 'ranran'@'localhost';
mysql> flushprivileges;

2、授予插入权限

mysql> grant insert on mysql.user to 'ranran'@'localhost';
mysql> flush privileges;

 3、授予更新权限

mysql> grant update on mysql.user to 'ranran'@'localhost';
mysql> flush privileges;

4、授予删除权限

mysql> grant delete on mysql.user to 'ranran'@'localhost';
mysql> flush privileges;

 5、查看授予的权限

mysql> show grants for 'ranran'@'localhost';
+----------------------------------------------------------------------------------------+
| Grants for ranran@localhost                                                            |
+----------------------------------------------------------------------------------------+
| GRANT CREATE, CREATE USER ON *.* TO 'ranran'@'localhost'                               |
| GRANT SELECT, INSERT, UPDATE, DELETE, CREATE ON `mysql`.`user` TO 'ranran'@'localhost' |
+----------------------------------------------------------------------------------------+
2 rows in set (0.00 sec)

 6、或者用一条命令插入

mysql> grant select,insert,update,delete on *.* to 'ranran'@'localhost';