题解 | 统计各等级会员用户下订单总额
统计各等级会员用户下订单总额
https://www.nowcoder.com/practice/48dd35a3dd8c4e1494db36b097a03300
当要求表连接后包含NULL数据的列时用left/right join,搭配if()/case when then end语句,完成统计需求
select vip,sum(if(order_price is null,0,order_price)) order_total from order_tb o right join uservip_tb u on o.user_id=u.user_id group by vip order by order_total desc

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