From: Mike Diehl <jdiehl@sandia.gov>
To: SQL Postgresql List <pgsql-sql@postgresql.org>
Subject: Problem with phone list.
Date: Wed, 15 Aug 2007 14:28:17 -0600
Message-ID: <200708151428.17740.jdiehl@sandia.gov> (raw)
Hi all.
I've qot a problem I need to solve. I'm sure it's pretty simple; I just can't
seem to get it, so here goes...
I've got a table, actually a view that joins 3 tables, that contains a phone
number, a unique id, and a call duration.
The phone number has duplicates in it but the unique id is unique.
I need to get a list of distinct phone numbers and the coorisponding largest
call duration.
I've got the idea that this should be a self-join on phone number where
a.id<>b.id, but I just can't seem to get the max duration.
Any hints would be much appreciated.
Mike.
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Reply to all the recipients using the --to and --cc options:
reply via email
To: pgsql-sql@postgresql.org
Cc: jdiehl@sandia.gov
Subject: Re: Problem with phone list.
In-Reply-To: <200708151428.17740.jdiehl@sandia.gov>
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
This inbox is served by DDX for PostgreSQL; see mirroring instructions
for how to clone and mirror all data and code used for this inbox