Extract only maximum date from column

From: Rich Shepard <rshepard(at)appl-ecosys(dot)com>
To: pgsql-general(at)postgresql(dot)org
Subject: Extract only maximum date from column
Date: 2025-12-04 19:55:08
Message-ID: db81f086-e1a5-5798-f9bd-5bed5b1bc7f4@appl-ecosys.com
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I want the script to extract only the maximum `next_contact' date and
haven't learned how to do this from my reading of web sites.

The script:

select p.person_nbr, p.company_nbr, c.next_contact
from people as p, contacts as c
where c.next_contact >= '2025-11-01'
group by p.person_nbr, p.company_nbr, c.next_contact
order by p.person_nbr, p.company_nbr, max(c.next_contact);

returns all contacts rather than only the latest one.

Is using a sub-select the proper way?

TIA,

Rich

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