权限。

create user 'cai'@'localhost' identified by 'cai111';

create user 'caicai'@'localhost' identified by 'cai111';

select user,password,host from mysql.user;

drop user 'cai'@'%';

drop user 'cai'@'localhost

select user();

select current_user();

show grants;

show processlist;

delete from mysql.user where host='127.0.0.1' or host='localhost.localdomain';

flush privileges;

drop user 'caiyinliang'@'localhost';

select user,password,host from mysql.user;

create user 'caiyinliang'@'%' identified by 'cai111';

show grants for caiyinliang@'%';

grant select on test.* to 'caiyinliang'@'%' identified by 'cai111';