LeetCode（数据库）- 每家商店的产品价格

Posted 2021-12-20 程序员牧码

题目链接：点击打开链接

题目大意：略。

解题思路：略。

AC 代码

-- 解决方案(1)
select
    product_id,
    sum(if(store='store1',price,null)) store1,
    sum(if(store='store2',price,null)) store2,
    sum(if(store='store3',price,null)) store3
from
    Products
group by
    1

-- 解决方案(2)
select
    distinct p.product_id, a.price store1, b.price store2, c.price store3
from
    Products p
left join 
    (select * from Products where store = 'store1') a on p.product_id = a.product_id
left join
    (select * from Products where store = 'store2') b on p.product_id = b.product_id
left join
    (select * from Products where store = 'store3') c on p.product_id = c.product_id