On Saturday 07 August 2004 04:12 am, Josh Berkus wrote:
>
> > Meanwhile, every other aspect of the data can change (e.g. a person can
> > change his name, sex, age, email, address, even date & place of birth).
> > Not to mention data entry mistakes. So it's impossible to use any
> > "real"/natural key in this case.
>
> Absolutely false. It's quite possible, it's just a
> performance/schema/data management issue. This also applies to my comment
> above.
why shouldnt the primary key change? the only key that should never change is
a key that is used as a foreign key in another table. In a table like this:
id serial unique
name varchar primary key
name may change - id will never change. id is used as the foreign key
--
regards
kg
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