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using 'count' to show number of dupes

From: Andy Harrison <aharrison(at)gmail(dot)com>
To: pgsql-novice(at)postgresql(dot)org
Subject: using 'count' to show number of dupes
Date: 2004-07-12 17:28:40
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-novice
I'm writing some perl to sendmail maillog reporting.  Since the logs
are too big to some of the things I want to do, I'm just stuffing it
to a pgsql db.  I'd like to offload as much of the work onto the db as
much as possible.

How can I use count to show rows with the same value in the column?

col1   col2   col3
foo1   bar1   baz1
foo2   bar1   baz2
foo3   bar2   baz3
foo4   bar3   baz4
foo5   bar1   baz5
foo6   bar2   baz6

So, what would get pg to show me that col2 has 3 'bar1' values, 2
'bar2' values and 1 'bar1' value.

Andy Harrison


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Next:From: Stephan SzaboDate: 2004-07-12 17:39:00
Subject: Re: using 'count' to show number of dupes
Previous:From: David.VentimigliaDate: 2004-07-12 16:11:18
Subject: FW: table inheritance and polymorphic functions

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