Janning Vygen <[EMAIL PROTECTED]> 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.

Jim

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