Re: How to use DISTINCT for two attributes combined

From: Lennart Jonsson <>
Date: 28 Jul 2003 09:59:20 -0700
Message-ID: <>

"Xiaoxin Yin" <> wrote in message news:<I12Va.4195$>...
> Hi,
> I want to select the count of distinct tuples in a table for some query. For
> example,
> select count(distinct A.a1, A.a2) from FirstRel A, SecondRel B where
> A.a3=B.b1 group by B.b2, B.b3
> (Suppose FirstRel.a1 and FirstRel.a2 is the primary key of FirstRel.)
> However, it is not recognized by sql server. Is there any way that I can get
> the count of distinct tuples in A?
> Thanks a lot,

You might try:

select count(1) from (

    select distinct A.a1, A.a2 from FirstRel A, SecondRel B     where A.a3=B.b1
) X (a1, a2)


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Received on Mon Jul 28 2003 - 18:59:20 CEST

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