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From: Ron Johnson <[email protected]>
To: pgsql-general <[email protected]>
Subject: Re: Extract only maximum date from column
Date: Thu, 4 Dec 2025 15:02:04 -0500
Message-ID: <CANzqJaC9+koXCtuqKFxqZdsyHEk7J3QxOqF3UAwC0W2dEi-6sA@mail.gmail.com> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>

On Thu, Dec 4, 2025 at 2:55 PM Rich Shepard <[email protected]>
wrote:

> 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?
>

May not be the only way, but it's how I do it:
SELECT *
FROM foo
WHERE some_dt = (SELECT MAX(some_dt) FROM foo);

It might return more than one row...

-- 
Death to <Redacted>, and butter sauce.
Don't boil me, I'm still alive.
<Redacted> lobster!

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