mysql授权、删除用户和角色权限

GRANT USAGE ON *.* TO ‘backup‘@‘172.16.0.157‘ IDENTIFIED BY PASSWORD ‘*38B4F16EADB1601E713D9F03F1DFA1F71C624A91‘;

#GRANT USAGE ON *.* TO ‘backup‘@‘172.16.0.157‘ IDENTIFIED BY  ‘123456‘;

GRANT SELECT, LOCK TABLES, SHOW VIEW, TRIGGER ON `pccb_pre`.* TO ‘backup‘@‘172.16.0.157‘;

GRANT SELECT ON *.* TO ‘zabbix‘@‘172.16.0.155‘ IDENTIFIED BY PASSWORD ‘*89AF6F71DE54E02F7D150CD66166A345C89DA896‘
或 GRANT USAGE ON *.* TO ‘zabix‘@‘%‘ IDENTIFIED BY PASSWORD ‘*A15001023857EC31A1C5B477A8C75B2DDE18C7EE‘

#所有权限
GRANT SELECT, INSERT, UPDATE, DELETE, CREATE, DROP, RELOAD, SHUTDOWN, PROCESS, FILE, REFERENCES, INDEX, ALTER, SHOW DATABASES, SUPER, CREATE TEMPORARY TABLES, LOCK TABLES, EXECUTE, REPLICATION SLAVE, REPLICATION CLIENT, CREATE VIEW, SHOW VIEW, CREATE ROUTINE, ALTER ROUTINE, CREATE USER, EVENT, TRIGGER ON *.* TO ‘root‘@‘192.168.80.4‘ identified by ‘123123123‘;

#授权某两张表
GRANT USAGE ON *.* TO ‘pccbnbbs_r‘@‘172.16.0.159‘ IDENTIFIED BY  ‘jdt7zrLyuPrsizcfb.6t‘ ;给上海李小明
GRANT SELECT ON `pccb_nbbs`.`article` TO ‘pccbnbbs_r‘@‘172.16.0.159‘;                                      
GRANT SELECT ON `pccb_nbbs`.`article_reply` TO ‘pccbnbbs_r‘@‘172.16.0.159‘;

all :表示所有操作增删改查
库名：表示针对库具有的操作权限，任何库使用*
表名：表示针对库中表具有的操作权限，任何表使用*
user：登录用户名
192.168.1.%：表示允许192.168.1这个网段的所有机器都具有登录权限。如果想任何电脑登录使用%
identified by ：设置登录密码
授权完要权限刷新,就是让权限数据写入内存
mysql> flush privileges;

revoke select,delete on db.table from ‘user‘@‘%‘

revoke all privileges on *.* from 3156dev@‘%‘;

select user,host from mysql.user where user=‘root‘;
show grants for ‘user‘@‘%‘; #查看用户有哪些权限

DROP USER ‘backup‘@‘172.16.0.157‘;