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For small tables you can bound the recursion depth: WITH my_cte(childId, parentId, depth, max_depth) AS ( SELECT r.childId, r.parentId, 1, (SELECT COUNT(*) FROM My_Table) FROM My_Table ...
Answer
#1: Initial revision
For small tables you can bound the recursion depth: WITH my_cte(childId, parentId, depth, max_depth) AS ( SELECT r.childId, r.parentId, 1, (SELECT COUNT(*) FROM My_Table) FROM My_Table r WHERE r.childId = 1 UNION ALL SELECT rel.childId, rel.parentId, sd.depth + 1, sd.max_depth FROM My_Table rel INNER JOIN my_cte sd ON rel.childId = sd.parentId WHERE sd.depth < sd.max_depth ) SELECT DISTINCT childId, parentId FROM my_cte This approach is limited by the bound that [`MAXRECURSION <= 32767`](https://docs.microsoft.com/en-us/sql/t-sql/queries/with-common-table-expression-transact-sql?view=sql-server-ver15).