Re: Examples of SQL anomalies?

From: Gene Wirchenko <>
Date: Thu, 26 Jun 2008 14:58:06 -0700
Message-ID: <>

"Artemus Ward" <artemus.ward_at_no.viagra.thanks> wrote:

>Before I waste a big chunk of next week, does anyone know of any docs on the
>web that attempt to gather together examples of anomolous behaviour in
>standard SQL? I am thinking particularly of things like inconsistent
>treatment of nulls. I've got a couple of (to me) very obvious examples but
>there must be many more.
>Failing that, can anyone suggest good Google search terms that might return
>a manageable number of hits? Nothing I've tried has been very useful.

     Others have mentioned nulls. One of my pet peeves in this area is that in SQL, if I sum zero numbers, the result is null. Mathematically, the result is 0. I have an app where I have had make adjustments where it is possible that zero numbers are summed.

     Try this one about duplicates:


Gene Wirchenko

Computerese Irregular Verb Conjugation:

     I have preferences.
     You have biases.
     He/She has prejudices.
Received on Thu Jun 26 2008 - 23:58:06 CEST

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