foreign key (foreign keyword)

A foreign key, also called a foreign keyword, in a database table is a key from another table that refers to (or targets) a specific key, usually the primary key , in the table being used.

A foreign key, also called a foreign keyword, in a database table is a key from another table that refers to (or targets) a specific key, usually the primary key , in the table being used. A primary key can be targeted by multiple foreign keys from other tables. But a primary key does not necessarily have to be the target of any foreign keys.

It is possible to change the primary key in a table when the specific needs of the users change. For example, the people in a town might be uniquely identified according to their driver license numbers in one application, but in another situation it might be more convenient to identify them according to their telephone numbers. When the primary key in a table is changed, the set of associated foreign keys, if there are any, often changes as a result.

This was first published in September 2005

Continue Reading About foreign key (foreign keyword)

Glossary

'foreign key (foreign keyword)' is part of the:

View All Definitions

Dig deeper on Oracle database design and architecture

Pro+

Features

Enjoy the benefits of Pro+ membership, learn more and join.

0 comments

Oldest 

Forgot Password?

No problem! Submit your e-mail address below. We'll send you an email containing your password.

Your password has been sent to:

File Extensions and File Formats

Powered by:

SearchDataManagement

SearchBusinessAnalytics

SearchSAP

SearchSQLServer

TheServerSide

SearchDataCenter

SearchContentManagement

SearchFinancialApplications

Close