题解 | 统计各等级会员用户下订单总额

select 
vip,
if(sum(order_sum) >0,sum(order_sum) ,0)order_total 
from(
select
o.user_id,
vip,
sum(order_price) order_sum
from uservip_tb u 
left join order_tb o on o.user_id =u.user_id	
group by o.user_id,vip ) t
group by vip
order by order_total desc

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