JLongo3925 Posted April 29, 2009 Report Posted April 29, 2009 What is the difference between Primary, Unique, and Index keys? When would I want to use each one? What are the advantages of using one over another? Quote
rudyten2000 Posted May 13, 2009 Report Posted May 13, 2009 What is the difference between Primary, Unique, and Index keys? When would I want to use each one? What are the advantages of using one over another? Primary key - This is the primary way to identify a Record in a table. Primary keys are UNIQUE Unique key - duh, a Key that is unique. It lets you enforce uniqueness on a field(s) other then primary key. Index key - index keys are help queries execute more efficiently when used in where clause BAHHHH - just go here for a better explanation: http://www.geekgirls.com/database_dictionary.htm Quote
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.