Searching database by number of linked records

[Kawa]

The title may not make much sense because I don't know how else to explain it with very few words. But basically, I have a database with three tables: Customers, Books and Orders (customers and books are linked to orders via their primary keys). And I need to have a query that shows all customers with 2 or more orders. Is this done by using some sort of sum?

[ranman256]

In a query, pull customers and count ([books])
under the criteria for count, put: >1