This week's book giveaway is in the OCMJEA forum. We're giving away four copies of OCM Java EE 6 Enterprise Architect Exam Guide and have Paul Allen & Joseph Bambara on-line! See this thread for details.
That's called a "join". I won't go into more detail than that, because learning database design from nothing by asking questions on a forum isn't the best way to learn things. Hopefully it gives you the right word to look up in the index of a book, though.