From: | "Andrea Aime" <aaime(at)comune(dot)modena(dot)it> |
---|---|
To: | pgsql-general(at)postgresql(dot)org |
Subject: | count & distinct |
Date: | 2000-06-15 10:32:46 |
Message-ID: | 3948B0CE.CEC21979@comune.modena.it |
Views: | Raw Message | Whole Thread | Download mbox | Resend email |
Thread: | |
Lists: | pgsql-general |
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...
From | Date | Subject | |
---|---|---|---|
Next Message | lampe | 2000-06-15 10:41:43 | libpgtcl.so missing from pgaccess on FreeBSD4.0? |
Previous Message | Marcos Lloret | 2000-06-15 10:04:58 | DateStyle is Postgres with US (NonEuropean) conventions |