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By using db<>fiddle, you agree to license everything you submit by Creative Commons CC0. 3364508 fiddles created (36252 in the last week).
SELECT VERSION();
VERSION()
8.0.26
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 hidden batch(es)
CREATE TABLE test (id INT, val INT); INSERT INTO test VALUES (1,1), (1,2), (2,3), (2,4); SELECT * FROM test;
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id val
1 1
1 2
2 3
2 4
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 hidden batch(es)
-- Incorrect ordering SELECT id, AVG(val) AS average, 1 - AVG(val) ordering_expression FROM test GROUP BY id ORDER BY 1 - average;
id average ordering_expression
1 1.5000 -0.5000
2 3.5000 -2.5000
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 hidden batch(es)
-- How to fix SELECT id, AVG(val) AS average, 1 - AVG(val) ordering_expression FROM test GROUP BY id ORDER BY 1 - AVG(val);
id average ordering_expression
2 3.5000 -2.5000
1 1.5000 -0.5000
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 hidden batch(es)