Topic: Can a foreign key reference a unique non-primary key?

[proud]

Hello everyone, I have 2 tables: [books] with the fields (id, title,author,isbn) and another table called [book issue] with the fields (id, borrower_id, borrow_date, book_isbn)..
Now the field (book_isbn) in the [book issue] table references (isbn) in the books table, which is a unique field but not a primary key.

My questions:

1- Is it correct for a foreign key to reference a unique but non-primary key in another table?

2- Is it okay for the foreign key field to have a different name than the field it references in the other table?

Your help is indeed appreciated..

[Mchl]

1. Yes
2. Yes


3. I would avoid using ISBN as a field referencing anything in database. I've been working in book publishing business for some time and have seen my sort of fscked up ISBNs along the way.