hi ,
try this :
select species2, count(*) from homol_loclink group by species2;
it will show you.
Regards
Omid
>From: Alexander Turchin <aturchin@chip.org>
>To: PostgreSQL Mailing List <pgsql-general@postgresql.org>
>Subject: [GENERAL] COUNTs don't add up
>Date: Mon, 23 Jul 2001 15:32:04 -0400
>
>Hello all,
>
>I have a database where (I believe; the database was not made by me) one
>of the columns contains only two values: A or B. When I count all the
>rows in the database I get X; when I count the rows containing A or B in
>that column I get X-2; when I count the rows containing neither A nor B
>I get 0. Any explanation (hopefully, again, I am doing something wrong
>:)?
>
>The actual queries are found below.
>
>Thanks!
>
>Alex
>
>aturchin=# SELECT COUNT(*) FROM homol_loclink
>aturchin-# WHERE (species2 = 'Mus musculus') OR
>aturchin-# (species2 = 'Rattus norvegicus');
> count
>-------
> 7110
>(1 row)
>
>aturchin=# SELECT COUNT(*) FROM homol_loclink;
> count
>-------
> 7112
>(1 row)
>
>aturchin=# SELECT COUNT(*) FROM homol_loclink
>aturchin-# WHERE (species2 <> 'Mus musculus') AND
>aturchin-# (species2 <> 'Rattus norvegicus');
> count
>-------
> 0
>(1 row)
>
>
>
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