SQL查询：查找在给定年份内购买了多本书的客户

这是数据库模式：

Books (bookid, title, author, year)
Customers (customerid, name, email)
Purchases (customerid, bookid, year)
Reviews (customerid, bookid, rating)
Pricing (bookid, format, price)

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我如何找到在2003年购买了不止一本书的客户显示他们的姓名和电子邮件地址？

与您的英语问题措辞非常相似。。。刚刚翻译成SQL

Select * From Customers C
Where (Select Count(*) From Purchases
       Where customerid = C.customerid
           And Year = 2003) > 1

还有一种选择：

select
  cu.name
 ,cu.email
 ,count(*) as books_purchased
from
  customers cu
 ,purchases pu
where cu.customerid = pu.customerid
  and pu.year = 2003
group by
  cu.name
 ,cu.email
having
  count(*) > 1

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你忘记了GROUPBY子句，但除此之外，这是迄今为止最好的答案删除了我自己的答案，因为我看错了问题，而你的答案是正确的+1给你，还有你的woorks+祝你好运。

select
  cu.name
 ,cu.email
 ,count(*) as books_purchased
from
  customers cu
 ,purchases pu
where cu.customerid = pu.customerid
  and pu.year = 2003
group by
  cu.name
 ,cu.email
having
  count(*) > 1