JLongo3925 Posted April 29, 2009 Report Share 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 Link to comment Share on other sites More sharing options...
rudyten2000 Posted May 13, 2009 Report Share 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 Link to comment Share on other sites More sharing options...
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