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HAVING Clause
Version dev
The HAVING
clause can be used after the GROUP BY
clause to provide filter criteria after the grouping has been completed. In terms of syntax the HAVING
clause is identical to the WHERE
clause, but while the WHERE
clause occurs before the grouping, the HAVING
clause occurs after the grouping.
Examples
-- count the number of entries in the "addresses" table that belong to each different city
-- filtering out cities with a count below 50
SELECT city, count(*)
FROM addresses
GROUP BY city
HAVING count(*) >= 50;
-- compute the average income per city per street_name
-- filtering out cities with an average income bigger than twice the median income
SELECT city, street_name, avg(income)
FROM addresses
GROUP BY city, street_name
HAVING avg(income) > 2 * median(income);
Syntax
Search Shortcut cmd + k | ctrl + k