聯表查詢

public function user()
{
         $join = [
            ['users w','a.user_id=w.user_id'],
        ];
        $user = Db::table('tp_users_kd')->alias('a')->join($join)->field('w.openid')->where(array('a.tuisong' => 1 , 'a.is_validated' => 5 ))->select();
        return $user;
 
}