Created
August 1, 2024 14:10
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Postgresql group by overlapping date periods
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| WITH period_ranges AS ( | |
| SELECT | |
| id, | |
| tstzrange(period_start, period_end) AS period | |
| FROM | |
| your_table | |
| ), recursive_group AS ( | |
| SELECT | |
| id, | |
| period, | |
| array[id] AS group_ids | |
| FROM | |
| period_ranges | |
| UNION ALL | |
| SELECT | |
| pr.id, | |
| pr.period, | |
| rg.group_ids || pr.id | |
| FROM | |
| recursive_group rg | |
| JOIN | |
| period_ranges pr ON rg.period && pr.period -- Check for overlap | |
| WHERE | |
| NOT rg.group_ids @> array[pr.id] -- Ensure no duplicates | |
| ) | |
| SELECT | |
| DISTINCT ON (id) | |
| id, | |
| period, | |
| group_ids | |
| FROM | |
| recursive_group | |
| ORDER BY | |
| id, array_length(group_ids, 1) DESC; |
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Haven't tested it