题目
编写一个 SQL 查询,查询购买了 S8 手机却没有购买 iPhone 的买家。
题解
使用having + sum+if,而不是自查询。
代码
# Write your MySQL query statement below
select buyer_id
from Sales s join Product p
on s.product_id = p.product_id
group by buyer_id
having sum(if(product_name='S8',1,0))>0
and sum(if(product_name='iPhone',1,0))=0