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