What is difference between foreign key and reference key?

Question

I am very confused about those two terms. Are they the same or different?

Some books and people say they are the same and others say they are different.

I tr

Answer 1

A foreign key "references" a key in some other table. That key in some other table is called Referenced key. You'll probably hear a lot about this if you're using Graphic feature on phpmyadmin.