>>My nephew asked for some help on a query and so far I can't seem to think of a good way to do it. Here is his question.
>>
>>A one-to-many relationship where the parent table is a list of customers and the child table is a list of things they've bought. It's easy enough to select customers who have bought a television. It's also simple to select customers who have bought a television or a couch. But how do I select customers who have bought both a television and a couch? The following is returning customers who have bought both or one of the items:
>>
>>
>>I don't have data to test with and I was hoping someone could had an idea.
>>
>>Thanks
>

>select Cust.CustomerId, Cust.CustomerName
>from Customer Cust
>inner join Sales S On Cust.CustomerId = S.CustomerId
>where S.Product IN ('Product1', 'Product2')
>GROUP BY Cust.CustomerID, Cust.CustomerName
>HAVING MIN(S.Product) = 'Product1' and MAX(S.Product) = 'Product2'

>
>This is solution for just two products.
>
>See more details in this article
>
>http://social.technet.microsoft.com/wiki/contents/articles/22165.t-sql-relational-division.aspx

Thanks both of you for the answer.