https://bugzilla.wikimedia.org/show_bug.cgi?id=24479

--- Comment #26 from Aryeh Gregor <simetrical+wikib...@gmail.com> 2011-01-02 
00:27:30 UTC ---
InnoDB tables should always have an explicit primary key.  Otherwise (if there
are no unique indexes) it will make a secret invisible primary key anyway,
which you can't observe or control.  Best to add an autoincrement primary key
if there are no possible unique keys as-is.

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