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MySQL primary, unique, and index keys


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  • 2 weeks later...
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

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