update wx_coupon_channel set begin_time = create_date where begin_time is null;
update wx_coupon_channel co, wx_coupon c set co.end_time = c.valid_end_date where co.target_ad != 2 and co.target_ad != 8 and co.coupon_id = c.id and c.valid_type = 1 and co.end_time is null;