From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
---|---|
To: | steven(dot)winfield(at)cantabcapital(dot)com |
Cc: | pgsql-docs(at)postgresql(dot)org |
Subject: | Re: Median missing from aggregate functions page |
Date: | 2016-12-23 15:21:39 |
Message-ID: | 25081.1482506499@sss.pgh.pa.us |
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Lists: | pgsql-docs |
steven(dot)winfield(at)cantabcapital(dot)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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