Display Parent-Child relationship when Parent and Child are stored in same table

Question

I have SQL Server table structure like below:

ID    Name     ParentID
-----------------------
1     Root       NULL
2     Business   1
3     Finance    1
4           


        

Answer 1

Like someone posted earlier, it needs to be a recursive function. There can be multiple scenarios - One Parent to Multiple Child (Level 1 Hierarchy) Parent 1 has Child 1 Parent 1 has Child 2 Child to Multiple Child (Level 2 Hierarchy) And so on.

My example has parent curve id and child curve id. For example,

WITH hierarchy AS
(select UT.parent_curve_id as origin, UT.*
from myTable UT
WHERE UT.parent_curve_id IN ( 1027455, 555)
UNION ALL
select h.origin, UT.*
from myTable UT
JOIN hierarchy h ON h.child_curve_id = UT.parent_curve_id
)
SELECT *
from hierarchy 
order by unique_key