"joe collins" <[EMAIL PROTECTED]> wrote:
> does MySQL support composite keys?
Yes, MySQL supports composite keys:
http://www.mysql.com/doc/en/Multiple-column_indexes.html
>
> I have a table 'Group_Map'
>
> This has 3 fields
>
> contact_id (primary key in another table)
> group_id (candidate key in another table)
> user_id (primary key in another table)
>
>
> is it possible / advisable to create and maintain a composite key for this
> table?
Sorry, I don't understand what exactly you want to get.
It depends on your queries on which columns it will be efficient to create an index.
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