Re: primary key and existing unique fields

Dawid,
I am interested in the first point you made that:
having varchar(12) in every referencing table, takes more storage
space.
The thing is though, if I have a serial primary key then it would be an
additional column. Or you are saying the space taken by a VARCHAR(12) field
is more than two INT fields? ( or is it the fact that when it is referenced
it will appear several times?) I guess the reason I am resisting the idea of
an additional primary key field is to avoid the additional lookup in some
queries. Perhaps it's a minor almost irrelevant performance factor.
Thanks
Sally

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