mysql: difference between primary key and unique index?

Posted by every_answer_gets_a_point on Stack Overflow See other posts from Stack Overflow or by every_answer_gets_a_point
Published on 2010-05-26T20:19:20Z Indexed on 2010/05/26 20:21 UTC
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i need to change one of the fields of a table to auto increment and to be the primary key. what does unique index mean?

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