Try
select identno, count(identno) from some_table group by identno having
count(identno) >=1;
-----Original Message-----
From: pgsql-general-owner@postgresql.org
[mailto:pgsql-general-owner@postgresql.org]On Behalf Of Peter E. Chen
Sent: Thursday, May 09, 2002 2:39 PM
To: pgsql-general@postgresql.org
Subject: [GENERAL] Quick SQL question . . .
Can anyone tell me what is the easiest way for me to tell if a column is
unique or not? I tried using DISTINCT ON and COUNT together in a SELECT
statement, but I can't seem to get the query to work:
SELECT DISTINCT ON (identno) count(identno) FROM some_table;
I was trying to figure out if the # of unique entries for a particular
column is equal to the # of total entries for that column.
Any suggestions?
Peter
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TIP 4: Don't 'kill -9' the postmaster
