内容一:查看没有密码有效期的用户
> SELECT user, host, password_lifetime,password_last_changed from mysql.user where password_lifetime is NULL;
内容二:查看用户最后的密码修改日期
> SELECT user, host, password_lifetime,password_last_changed from mysql.user;
> SELECT user, host, password_lifetime,password_last_changed from mysql.user where password_lifetime is NULL;
> SELECT user, host, password_lifetime,password_last_changed from mysql.user;