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Developer-C 11.1
3.0
4.0
10.2
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10.6
10.7
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10.9
5.5
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11g Release 2
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8.4
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10
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3.8
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3.27
3.39
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AdventureWorks
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WITH t as ( SELECT * FROM (VALUES (1, NULL), (2, 1), (3, 1), (4, 2), (5, 3), (6, 8), (7, 9) ) v(id, parentId) ), CTE AS ( SELECT Id, ParentId FROM t WHERE ParentId IS NULL UNION ALL SELECT t.Id, t.ParentId FROM t INNER JOIN CTE c ON t.ParentId = c.Id ) SELECT * FROM CTE
Id
ParentId
1
null
2
1
3
1
5
3
4
2