From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
---|---|
To: | "Johnson, Shaunn" <SJohnson6(at)bcbsm(dot)com> |
Cc: | pgsql-general(at)postgresql(dot)org |
Subject: | Re: multiple counts using CASE |
Date: | 2002-03-19 15:18:32 |
Message-ID: | 29058.1016551112@sss.pgh.pa.us |
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Lists: | pgsql-general |
"Johnson, Shaunn" <SJohnson6(at)bcbsm(dot)com> writes:
> Wonder if it is possible to get multiple counts
> from ONE query using the CASE statement.
If I'm understanding you correctly, you can't do what you want with
a single aggregate function call, because that will only give you
one result.
Consider something like
select
sum(case when logic = '1' then 1 else 0 end),
sum(case when logic = '2' then 1 else 0 end),
sum(case when logic = '3' then 1 else 0 end)
from ...
I also wonder whether you aren't reinventing the notion of GROUP BY.
F'r instance
select logic, count(*) from ... group by logic;
regards, tom lane
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