MySQL怎样利用DCL管理用户和控制权限

-- 创建用户
CREATE USER '用户名'@'主机名' IDENTIFIED BY '密码';

CREATE USER 'Summerday'@'localhost' IDENTIFIED BY '123456';

-- 修改密码
SET PASSWORD FOR '用户名'@'主机名' = PASSWORD('新密码');

SET PASSWORD FOR 'Summerday'@'localhost' = PASSWORD('hyh123');

-- 1. 切换到mysql数据库
USE mysql;
-- 2. 查询user表
SELECT * FROM USER;

-- 删除用户
DROP USER '用户名'@'主机名';

DROP USER 'Summerday'@'localhost';

-- 查询权限
SHOW GRANTS FOR '用户名'@'主机名';

SHOW GRANTS FOR 'Summerday'@'localhost';

-- 授予权限
GRANT 权限列表 ON 数据库名.表名 TO '用户名'@'主机名';

GRANT SELECT ON mydb2.account TO 'Summerday'@'localhost';

-- 授予所有权限
GRANT ALL ON *.* TO 'Summerday'@'localhost';

-- 撤销权限
REVOKE 权限列表 ON 数据库名.表名 FROM '用户名'@'主机名';

REVOKE SELECT ON mydb2.account TO 'Summerday'@'localhost';

-- 撤销所有权限
REVOKE ALL ON *.* FROM 'Summerday'@'localhost';