Re: rewrite group by query

From: Boris Dali <boris_dali_at_yahoo.ca>
Date: Mon, 05 Jan 2004 08:09:25 -0800
Message-ID: <F001.005DBB79.20040105080925@fatcity.com>

How about

select * from (select tab1.*, count(a) over(partition by a) a_count from tab1) where a_count =1;

... would probably save you one pass over tab1.

Thanks,
Boris Dali.

• elain he <elainhe_at_hotmail.com> wrote: > Hi,
  > Does anyone have a better way of rewriting the
  > following query? I'm trying
  > to avoid querying the table, tab1 twice.
  >
  > select a, b from tab1
  > where a in (select a from tab1 group by a having
  > count(*)=1);
  >
  >
  > Thanks.
  >
  > elain
  >
  >
  

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Received on Mon Jan 05 2004 - 10:09:25 CST