From: | "G(dot) Anthony Reina" <reina(at)nsi(dot)edu> |
---|---|
To: | reina(at)nsi(dot)edu, "pgsql-questions(at)postgresql(dot)org" <pgsql-sql(at)postgreSQL(dot)org> |
Subject: | Having trouble with join |
Date: | 1998-09-25 00:49:41 |
Message-ID: | 360AE8A5.15CDE741@nsi.edu |
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Lists: | pgsql-sql |
I have a subquery that I'd like to make a join instead to see if it is
any faster.
subquery: select distinct cell from center_out_cell where rep in
(select rep from center_out_opto where marker = 5);
All this does is find the occurrences of 'cell' that have 'marker' = 5.
However, 'cell' is defined in table center_out_cell and 'marker' is
defined in table 'center_out_opto'. Both tables have 'rep' so that ties
them together. The subquery gives me the correct results.
I tried this for a join but didn't get the right result:
select distinct cc.cell from center_out_cell cc, center_out_opto co
where co.marker = 5 and co.rep = cc.rep;
Can anyone tell me what I'm doing wrong?
Does this sound more like a subquery or a join?
Thanks
-Tony
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