关于CDbCriteria [ 1.1 版本 ]

SELECT game_tag,platform_tag,FROM_UNIXTIME(order_time,"%Y-%m") as order_time,platform_id,
sum(pay_diamond) as pay_diamond,sum(pay_money) as pay_money,
sum(real_money) as real_money,group_id,channel_id
FROM (SELECT * FROM tbllog_pay GROUP BY order_id) t
WHERE FROM_UNIXTIME(order_time,"%Y-%m") >= '2015-02' AND	
FROM_UNIXTIME(order_time,"%Y-%m") <='2015-02' GROUP BY log_ym,group_id,channel_id

这个sql如果要转换成CDbCriteria，要如何？