mysql ORDER BY和 GROUP BY

今天把网站的mysq版本更新到最新版本了为5.7  在查询语句的时候出现了一个错误语句  ：  

 ORDER BY clause is not in GROUP BY clause and contains nonaggregated column 'g2yx_yy.u.login_time' which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by  

这个语句的错误是 order by 的语句中 没有依赖于group by语句中    下面是我之前写的错误语句 

$myGameData = Db::name('user_played')
    ->alias('u')
    ->join('game g','g.id = u.game_id')
    ->join('area a','a.id = u.area_id AND a.game_id = u.game_id')
    ->field($condition['field'])
    ->where($condition['where'])
    ->group('u.area_id')
    ->order('u.login_time DESC')
    ->select();

上面也说到了为啥报错 后面把sql语句变为

$myGameData = Db::name('user_played')
    ->alias('u')
    ->join('game g','g.id = u.game_id')
    ->join('area a','a.id = u.area_id AND a.game_id = u.game_id')
    ->field($condition['field'])
    ->where($condition['where'])
    ->group('u.area_id,u.login_time')
    ->order('u.login_time DESC')
    ->select();

就能把问题解决了