CActiveRecord中使用group语句问题

[weixin_38087237]

数据列id, time char(14), money float(12,2)ActiveRecord属性id, time, money现在想查找select left(time, 8), sum(money) from _table_ group by left(time, 8) order by time asc怎么处理呢-------------------        $criteria_income = new CDbCriteria();        $criteria_income->select = 'left(time, 8) AS time, sum(money) AS money';        // $criteria_income->addBetweenCondition('time', $start_date, $end_date);        $criteria_income->group = 'left(time, 8)';        $criteria_income->order = 'time ASC';

[weixin_38091938]

给对应的model新建一个属性