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help / color / mirror / Atom feedFrom: David G. Johnston <[email protected]>
To: Willow Chargin <[email protected]>
Cc: [email protected] <[email protected]>
Cc: [email protected] <[email protected]>
Subject: Re: Functionally dependent columns in SELECT DISTINCT
Date: Fri, 13 Sep 2024 08:43:54 -0700
Message-ID: <CAKFQuwYEtU7doien_XGh58vjRdsJezXp2BQvKdLcyVZQwhLmgg@mail.gmail.com> (raw)
In-Reply-To: <CAALRJs5QkE-yWVdxQxOLXbM8DyPVV3M_=zfsPK17SV-zHQsASQ@mail.gmail.com>
References: <CAALRJs5ne=gPYG=FdeY-G0p9QyjXHhPhAyAsJ_evdCwG3vuhug@mail.gmail.com>
<[email protected]>
<CAALRJs5QkE-yWVdxQxOLXbM8DyPVV3M_=zfsPK17SV-zHQsASQ@mail.gmail.com>
On Friday, September 13, 2024, Willow Chargin <[email protected]>
wrote:
> In reality I really do want the ID columns of the
> *most recent* items.
>
Use a window function to rank them and pull out rank=1, or use a lateral
subquery to surgically (fetch first 1) retrieve the first row when sorted
by recency descending.
David J.
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Subject: Re: Functionally dependent columns in SELECT DISTINCT
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