An alternate key is a unique identifier for an entity instance that has not been selected as the primary key. In the following Order entity, for example, Order_Identifier is the primary key and Order_Number is the alternate key (see Figure 1).

Figure 1: Design Challenge Example

Register or login for access to this item and much more

All Information Management content is archived after seven days.

Community members receive:
  • All recent and archived articles
  • Conference offers and updates
  • A full menu of enewsletter options
  • Web seminars, white papers, ebooks

Don't have an account? Register for Free Unlimited Access