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WITH yourTable AS ( SELECT 1 AS id, 4433 AS score UNION ALL SELECT 1, 678 UNION ALL SELECT 1, 1230 UNION ALL SELECT 1, 414 UNION ALL SELECT 5, 8899 UNION ALL SELECT 5, 123 UNION ALL SELECT 6, 2345 UNION ALL SELECT 6, 567 UNION ALL SELECT 6, 2323 ), cte AS ( SELECT *, ROW_NUMBER() OVER (PARTITION BY id ORDER BY score DESC) rn FROM yourTable ) SELECT id, ABS(MAX(score) FILTER (WHERE rn = 1) - MAX(score) FILTER (WHERE rn = 2)) AS score FROM cte GROUP BY id;
id
score
1
3203
5
8776
6
22
SELECT 3