public inbox for [email protected]  

help / color / mirror / Atom feed

From: Bruno Wolff III <[email protected]>
To: Laurenz Albe <[email protected]>
Cc: Tom Lane <[email protected]>
Cc: [email protected]
Subject: Re: Can any_value be used like first_value in an aggregate?
Date: Thu, 27 Jun 2024 08:06:29 -0500
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>
	<[email protected]>
	<[email protected]>
	<[email protected]>

On Wed, Jun 26, 2024 at 09:50:59 +0200,
  Laurenz Albe <[email protected]> wrote:
>On Tue, 2024-06-25 at 14:11 -0500, Bruno Wolff III wrote:
>> The actual
>> use case is a set of tripplets returned from a query, where I want on
>> row for each distinct value in the first column, paired with the value
>> in the second column, for which the third column is the largest. The
>> second and third columns are effectively dependent on each other, so there
>> won't be any ambiguity.
>
>Try
>
>  SELECT DISTINCT ON (first_column)
>         first_column,
>         second_column,
>         third_column
>  FROM the_table
>  ORDER BY first_column, third_column DESC;

That approach worked for that part of the query. Thanks.

reply

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: [email protected]
  Cc: [email protected], [email protected], [email protected], [email protected]
  Subject: Re: Can any_value be used like first_value in an aggregate?
  In-Reply-To: <[email protected]>

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

This inbox is served by agora; see mirroring instructions
for how to clone and mirror all data and code used for this inbox