Re: PostgreSQL needs percentage function

From: "David G(dot) Johnston" <david(dot)g(dot)johnston(at)gmail(dot)com>
To: Edson Carlos Ericksson Richter <richter(at)simkorp(dot)com(dot)br>
Cc: pgsql-general(at)lists(dot)postgresql(dot)org
Subject: Re: PostgreSQL needs percentage function
Date: 2017-12-18 17:01:19
Message-ID: CAKFQuwa_K2yMB+O0-xJHzKG6tsbcakwK1zf+qLcACgBs1ayFhQ@mail.gmail.com
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On Mon, Dec 18, 2017 at 9:56 AM, Edson Carlos Ericksson Richter <
richter(at)simkorp(dot)com(dot)br> wrote:

> But, is it possible to have a aggregate function that calculates de
> percent from the sum (and/or count) total (as a value from 0 ... 1) for
> numeric (or double)?
>

​Do you mean:

SELECT id, val, val / (sum(val) OVER ())
FROM vals;​

​David J.​

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