Re: SELECT DISTINCT ON removes results

From: "David G(dot) Johnston" <david(dot)g(dot)johnston(at)gmail(dot)com>
To: Guyren Howe <guyren(at)gmail(dot)com>
Cc: pgsql-general <pgsql-general(at)postgresql(dot)org>
Subject: Re: SELECT DISTINCT ON removes results
Date: 2016-10-29 00:29:10
Message-ID: CAKFQuwY8jkPy1EB97WqLFMu2ATLQ7_ueHAczt5s4UDdp8-iMog@mail.gmail.com
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On Fri, Oct 28, 2016 at 2:17 PM, Guyren Howe <guyren(at)gmail(dot)com> wrote:

> On Oct 28, 2016, at 14:15 , Guyren Howe <guyren(at)gmail(dot)com> wrote:
>
>
> On Oct 28, 2016, at 13:50 , David G. Johnston <david(dot)g(dot)johnston(at)gmail(dot)com>
> wrote:
>
>
> ​On its face the statement "DISTINCT ON removes results" is not at all
> surprising given its definition.
>
>
> What is surprising is that it removes *all* results…
>
>
> The inner query on its own appears to produce the same results, but the
> left join with it in either case produces different results.
>

​Then maybe you can help us and create reproducible example that
demonstrates the bug so that it can be fixed.

David J.

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