Re: [HACKERS] VIEWS, DISTINCT and COUNT

Brian Hirt wrote:
>Okay,
>
>I'm used to a feature that allows combining count and distinct in Sybase.
>I thought it was standard SQL and expected to see it in Postgres. Whatever
>the case might be, postgres does not seem to support this. I keep running
>into queries that I cannot write. Here's the skinny:
>
>"select count(distinct id) from table" is not supported.

I'm not convinced I understand what your query would do, but it sounds as
if you need to use GROUP BY. For example:

lfix=> select custid, count(custid) from invoice group by custid;
custid |count
--------+-----
ACECS | 1
ADG | 8
FALKIRK | 1
JEFSYS | 25
SOLPORT | 15
(5 rows)

lfix=> select count(*) from invoice;
count
-----
50
(1 row)

Is that what you want to achieve?

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