From: | PG Doc comments form <noreply(at)postgresql(dot)org> |
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To: | pgsql-docs(at)lists(dot)postgresql(dot)org |
Cc: | michal(dot)palenik(at)freemap(dot)sk |
Subject: | nicer examples for aggregate calls |
Date: | 2021-10-23 13:51:48 |
Message-ID: | 163499710897.684.7420075366995883688@wrigleys.postgresql.org |
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Lists: | pgsql-docs |
The following documentation comment has been logged on the website:
Page: https://www.postgresql.org/docs/14/tutorial-agg.html
Description:
currently, all of the examples are very simple, like
SELECT city, max(temp_lo)
FROM weather
WHERE city LIKE 'S%' -- (1)
GROUP BY city
HAVING max(temp_lo) < 40;
this example would be more complex and would allow users to search for
clause "filter":
Finally, if we only care about cities whose names begin with āSā and we want
to calculate the number of observations in each city with temp_lo over 30,
we might do:
SELECT city, max(temp_lo), count(*) filter (temp_lo>30),
FROM weather
WHERE city LIKE 'S%' -- (1)
GROUP BY city
HAVING max(temp_lo) < 40;
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