From: | Vashenko Maxim <max(at)nino(dot)ru> |
---|---|
To: | pgsql-general(at)postgresql(dot)org |
Subject: | Re: count & distinct |
Date: | 2000-06-15 11:25:24 |
Message-ID: | 3948BD24.12C66D59@nino.ru |
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Thread: | |
Lists: | pgsql-general |
Andrea Aime wrote:
>
> Hi people. I would like to make a query that
> tells me how many distinct values there are
> in a column. Standard count doesn't seems
> to support a count distinct option.
> select distint count(*) of course doens't
> work (distinti clause is applied after the
> result are calculated). I've tried to define
> a view, but it didn't worked (
> create view distValues as select distinct ...
> but views doesn't support distinct clause)...
>
> Well, maybe I should create a new aggregate
> function, but before spending time on PGSQL
> guide I would like to know if someone can
> give me a fast tip... ;-)
> Thanks in advance
> Andrea
>
> PS: well, of course I can open a cursor on
> a "select distinct column from table" and then
> loop over the cursor couting how many values
> there are, but it seem a bit ugly...
SELECT field, count(*) FROM table GROUP BY field
With best regards, Max Vaschenko,
Nizhny Novgorod Information Networks.
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