$model->join('student on user.id = student.user_id') ->join('department on student.department_id = department.id') ->where($condition) ->getField('user.id as id,user.name as name, department.name as department, user.school_identify as schoolIdentify',$num);
修正代码:
$model->join('student on user.id = student.user_id') ->join('department on student.department_id = department.id') ->where($condition)->limit($num) ->getField('user.id as id,user.name as name, department.name as department, user.school_identify as schoolIdentify');
