RECURSIVE CTE SQL - Find next available Parent - sql

Question

I have parent child relation SQL table
LOCATIONDETAIL Table
OID NAME PARENTOID
1 HeadSite 0
2 Subsite1 1
3 subsite2 1
4 subsubsite1 2
5 subsubsite2 2
6 subsubsite3 3
RULESETCONFIG
OID LOCATIONDETAILOID VALUE
1 1 30
2 4 15
If i provide Input as LOCATIONDETAIL 6, i should get RULESETCONFIG value as 30
because for
LOCATIONDETAIL 6, parentid is 3 and for LOCATIONDETAIL 3 there is no value in RULESETCONFIG,
LOCATIONDETAIL 3 has parent 1 which has value in RULESETCONFIG
if i provide Input as LOCATIONDETAIL 4, i should get RULESETCONFIG value 15
i have code to populate the tree, but don't know how to find the next available Parent
;WITH GLOBALHIERARCHY AS
(
SELECT A.OID,A.PARENTOID,A.NAME
FROM LOCATIONDETAIL A
WHERE OID = #LOCATIONDETAILOID
UNION ALL
SELECT A.OID,A.PARENTOID,A.NAME
FROM LOCATIONDETAIL A INNER JOIN GLOBALHIERARCHY GH ON A.PARENTOID = GH.OID
)
SELECT * FROM GLOBALHIERARCHY

Answer 1

This will return the next parent with a value. If you want to see all, remove the top 1 from the final select.
dbFiddle
Example
Declare #Fetch int = 4
;with cteHB as (
Select OID
,PARENTOID
,Lvl=1
,NAME
From LOCATIONDETAIL
Where OID=#Fetch
Union All
Select R.OID
,R.PARENTOID
,P.Lvl+1
,R.NAME
From LOCATIONDETAIL R
Join cteHB P on P.PARENTOID = R.OID)
Select Top 1
Lvl = Row_Number() over (Order By A.Lvl Desc )
,A.OID
,A.PARENTOID
,A.NAME
,B.Value
From cteHB A
Left Join RULESETCONFIG B on A.OID=B.OID
Where B.VALUE is not null
and A.OID <> #Fetch
Order By 1 Desc
Returns when #Fetch=4
Lvl OID PARENTOID NAME Value
2 2 1 Subsite1 15
Returns when #Fetch=6
Lvl OID PARENTOID NAME Value
1 1 0 HeadSite 30

Answer 2

This should do the job:
;with LV as (
select OID ID,PARENTOID PID,NAME NAM, VALUE VAL FROM LOCATIONDETAIL
left join RULESETCONFIG ON LOCATIONDETAILOID=OID
), GH as (
select ID gID,PID gPID,NAM gNAM,VAL gVAL from LV where ID=#OID
union all
select ID,PID,NAM,VAL FROM LV INNER JOIN GH ON gVAL is NULL AND gPID=ID
)
select * from GH WHERE gVAL>0
See here for e little demo: http://rextester.com/OXD40496