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CREATE TABLE test (id INT); INSERT INTO test VALUES (1), (2), (3), (4), (5), (9), (10), (11), (12), (20);
10 rows affected
WITH cte1 AS ( SELECT id, id - ROW_NUMBER() OVER (ORDER BY id) grp FROM test ), cte2 AS ( SELECT CASE WHEN MIN(id) < MAX(id) THEN MIN(id)::text || '-' || MAX(id)::text ELSE MIN(id)::text END single_range FROM cte1 GROUP BY grp ORDER BY grp ) SELECT STRING_AGG(single_range, ', ') ranges_list FROM cte2;
ranges_list
1-5, 9-12, 20