Pokud máte pevný počet úrovní
Příklad
Declare @YourTable Table ([Id] int,[Parent] int,[Name] varchar(50),[Level] int)
Insert Into @YourTable Values
(1,NULL,'Clinical',1)
,(2,NULL,'Custom',1)
,(3,NULL,'Medicare',1)
,(4,NULL,'Validation',1)
,(5,1,'Medicaid',2)
,(6,2,'CD',2)
,(7,3,'Specialty',2)
,(8,5,'Fraud',3)
,(9,2,'Institutional',3)
,(10,8,'Professional',4)
;with cteP as (
Select Id
,Parent
,PathID = cast(Id as varchar(500))
,PathNm = cast(name as varchar(500))
From @YourTable
Where Parent is null
Union All
Select Id = r.Id
,Parent = r.Parent
,PathID = cast(p.PathID+', '+cast(r.Id as varchar(25)) as varchar(500))
,PathNm = cast(p.PathNm+'||'+r.name as varchar(500))
From @YourTable r
Join cteP p on r.Parent = p.Id)
Select B.*
,ID = A.PathID
From cteP A
Cross Apply (
Select Level1 = ltrim(rtrim(xDim.value('/x[1]','varchar(max)')))
,Level2 = ltrim(rtrim(xDim.value('/x[2]','varchar(max)')))
,Level3 = ltrim(rtrim(xDim.value('/x[3]','varchar(max)')))
,Level4 = ltrim(rtrim(xDim.value('/x[4]','varchar(max)')))
From (Select Cast('<x>' + replace((Select replace(PathNm,'||','§§Split§§') as [*] For XML Path('')),'§§Split§§','</x><x>')+'</x>' as xml) as xDim) as X
) B
Order by A.PathID
Vrátí se
