SQL之find_in_set用法

SELECT aa.*,(SELECT SUM(cost_price)  from orders_product WHERE  FIND_IN_SET(orders_id,aa.rr)) as cost_price_total FROM (select 
       left(create_time,10) as orderDay,
       sum(money_product) as moneyProduct,
       sum(money_order) as moneyOrder,
       sum(money_paid_reality) as moneyPaidReality,
       SUM(money_coupon) as yhq,
       SUM(cost_price) as cost,
id as aa,
GROUP_CONCAT(id) as rr,
count(1) as count
   from orders
where
   `order_state` != 6
   and `is_parent` = 0
group by orderDay
   order by orderDay desc) aa