Mysql Help! UNIQUE vs INDEX difference.
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Thread: Mysql Help! UNIQUE vs INDEX difference.

  1. #1
    Senior Member Paul help!'s Avatar
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    Aug 2013
    Manchester, England.

    Mysql Help! UNIQUE vs INDEX difference.

    Hi guys.

    I just have a simple question in regards to creating UNIQUE and INDEX columns in mysql.

    I understand what 'UNIQUE and INDEX' do and what their differences are,, but the only thing I am not sure of is whether 'INDEX' can be used for multiple columns like 'UNIQUE' can?


  2. #2
    High Energy Magic Dept. NogDog's Avatar
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    Aug 2006
    Yes. UNIQUE is really just a specific type of INDEX.

    Primary keys can also be across multiple columns -- they're basically a special case of a unique index.
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