Re: Requirements for update languages?

From: Jan Hidders <>
Date: 15 Nov 2002 13:50:36 +0100
Message-ID: <3dd4ed9c$>

Lauri Pietarinen wrote:
>One further observation came to mind:
>With the bag-representation you just mentioned it is possible to
>remove the duplicates, or reduce the number of them just by
>"updating" the counter. This is not possible in SQL (without
>some internal rowid).
>So would it be fair to say that SQL does not even really adher to
>a bag-model?

If you mean that as a bag calculus it has some very obvious short-comings and cannot even express certain things that can be expressed with SQL if you simulate the bags with sets of element-cardinality pairs, then, yes, you are right.

  • Jan Hidders
Received on Fri Nov 15 2002 - 13:50:36 CET

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