Two foreign keys instead of primary

Question

I was wondering, is there any possibility to create a table without a primary key, but with two foreign keys, where the foreign keys pairs are always different? For example,

Answer 1

You want a compound primary key.

Answer 2

If you aren't doing any sort of query that needs it, you don't need a primary key. It makes it a tiny bit harder to delete a record unambiguously, though. You might want to put a unique constraint on item_id,warehouse_id if Oracle allows that.