如码如下。是3.2版本下的，现在升级到5.0 下面语句该如何修改呢？
$array = M()->table($table.' as ot,think_question as q')
->where('ot.question_id = q.id AND q.status = 1 AND ot.user_id = '.$uid.' AND q.'.$column_name.' = '.$subId.$where)
->field('ot.id')
->group('ot.question_id')
->select();