Hmm, I guess when I think about composite keys I think of ways to indicate a specific field/column as being part of the key. Data duplication along with string

Hmm, I guess when I think about composite keys I think of ways to indicate a specific field/column as being part of the key. Data duplication along with string concatenation aren't really an elegant way to do it. If I remember right you also can't update the key values once the record has been saved. This is coming from a big SQL guy though :)