Re: How to use as Functional Index to be used as Primary KEY - Mailing list pgsql-general

Am Montag, 2. August 2004 13:57 schrieb Jim Seymour:
> Janning Vygen <vygen@gmx.de> wrote:
>
> [snip]
>
> > Thanks to Tom and Peter for your answers. I will design my table without
> > a primary key and use my unique index instead of a primary key. As this
> > unique key is the same as a primary key i dont see the reason why
> > postgresql should't extend the specs and allow functional primary key
> > indizes.
>
> Because, as Tom Lane wrote: "The SQL spec says that primary keys are
> columns or lists of columns."  Unlike some other SQL RDBMs, PostgreSQL
> at least *tries* (mostly) to be SQL standards compliant.

There are MANY things which are not standard compliant in PostgreSQL and my
guess is that the SQL spec doesn't even know anything about indizes.

kind regards,
janning