> The references are all to the same table i.e. they are employee ids, so > leaving some and not others would make no sense. The table has no > deletes, small amount of inserts and moderate amount of updates. However > there are many selects and its their performance I am most concerned with.
Foreign keys have no impact on selects. Although this does sound like a rather strange design to me (20+ columns wide and they're all employee ids?)
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