From: Tom Lane <tgl@sss.pgh.pa.us>
To: steven.winfield@cantabcapital.com
Cc: pgsql-docs@postgresql.org
Subject: Re: Median missing from aggregate functions page
Date: Fri, 23 Dec 2016 10:21:39 -0500
Message-ID: <25081.1482506499@sss.pgh.pa.us> (raw)
In-Reply-To: <20161223102056.25614.1166@wrigleys.postgresql.org>
References: <20161223102056.25614.1166@wrigleys.postgresql.org>
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steven.winfield@cantabcapital.com writes:
> The index contains an entry for "median" on the aggregate functions page,
> but there is no mention of it there.
Hm --- that <indexterm> entry is attached to the percentile_cont()
function, which can be used to implement median, but I agree that
a person who already knew that would probably not be following the
index pointer.
It might be more useful to point to 4.2.7. Aggregate Expressions
which contains a concrete example of how to implement median
with percentile_disc().
Another idea is to just make the index entry say
"See percentile_cont() and percentile_disc()".
regards, tom lane
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To: pgsql-docs@postgresql.org
Cc: tgl@sss.pgh.pa.us, steven.winfield@cantabcapital.com
Subject: Re: Median missing from aggregate functions page
In-Reply-To: <25081.1482506499@sss.pgh.pa.us>
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