豆豆

select * from wx_chat where  create_time in (SELECT MAX(create_time) from wx_chat where receiver_id =2 or sender_id=2 GROUP BY  CONCAT(if(sender_id>receiver_id,sender_id,rece

Mysql修改root密码#查看数据库用户表;SELECT * FROM mysql.user;#查看用户root的字段，没有password字段时密码字段为authentication_string;SELECT * FROM USER WHERE USER=‘root’;#修改用户root的密码;UPDATE mysql.user SET authentication_string...