Change select with connect by prior from Oracle to SQL Server - sql-server

Question

Hello I have this part of a view in an Oracle database and I must change it on Microsoft Sql Server.
with V_LOCHIERARHY_N
(nr, nivel, location, parent, systemid, siteid, orgid, count_a, count_wo, children)
AS
SELECT LEVEL, LPAD (' ', 2 * (LEVEL - 1)) || l.LOCATION nivel,
LOCATION, PARENT, systemid, siteid, orgid,
(SELECT COUNT (a.ancestor)
FROM locancestor a
WHERE a.LOCATION = l.LOCATION AND a.siteid = l.siteid),
NVL (COUNT (w.wonum), 0)
FROM maximo.workorder w
WHERE ( w.reportdate >
TO_TIMESTAMP ('2006-06-19 00:00:01',
'YYYY-MM-DD HH24:MI:SS.FF'
)
AND w.istask = 0
AND w.worktype <> 'P'
AND w.LOCATION = l.LOCATION
)
AND w.status <> 'CAN'),
l.children
FROM lochierarchy l
START WITH l.LOCATION = 'StartPoint'
CONNECT BY PRIOR l.LOCATION = l.PARENT AND l.siteid = 'SiteTest'
What I need from this script is to return all the children of a given entry (the description of the children which can be found in locations table).
I have a table with next columns:
Location Parent Systemid Children Siteid Origid Lochierarchyid
A001 StartPoint Primary 2 SiteTest X 106372
A002 A001 Primary 2 SiteTest X 105472
A003 A002 Primary 0 SiteTest X 98654
A004 A002 Primary 1 SiteTest X 875543
A004B A004 Primary 0 SiteTest X 443216
B005 StartPoint Primary 0 SiteTest X 544321
For example for given entry A001 will return
A002
A003
A004
A004B
B005
I have made this view below but I don't know how to integrate it with the first one. Also it doesn't return me the list in the corectly order
Parent
Children 1 of parent
Children a of children 1
children b of children 1
children 2 of parent
children a1 of children 2 and so on.
WITH testCTE AS
(
SELECT l.parent, l.location as child, l.location, l.lochierarchyid
FROM lochierarchy l
where location='SecondLocation' --and siteid='SiteTest'
UNION ALL
SELECT c.Parent, l.parent, l.location, l.lochierarchyid
FROM lochierarchy l
INNER JOIN testCTE c ON l.parent = c.location
)
SELECT *
FROM testCTE c
order BY c.parent,child asc
;
Can please someone help me? :)

Answer 1

Following the query proposed by mathguy, modified for MSSQL (2012)
with
inputs ( location, parent ) as (
select 'A001' , 'StartPoint' union all
select 'A002' , 'A001' union all
select 'A003' , 'A002' union all
select 'A004' , 'A002' union all
select 'A004B', 'A004' union all
select 'B005' , 'StartPoint'
),
r (lvl, location, ord ) as (
select 1, location, CAST(location AS VARCHAR(400))
from inputs
where parent = 'StartPoint'
union all
select r.lvl + 1, i.location, CAST(r.location + '/' + i.location AS VARCHAR(400))
from r join inputs i on r.location = i.parent
)
select REPLICATE(' ', 2 * (lvl-1)) + location as location
from r
order by ord
;
Ouput:
location
-------------------------------------------------------------------
A001
A002
A003
A004
A004B
B005

Answer 2

Here is how you can do this (in Oracle, the only flavor I know) using a recursive query. "The web" reports SQL Server implements recursive queries as well, and with the same syntax (I believe all of this is SQL Standard compliant, so that's not surprising). Give it a try.
Instead of creating a table, I put all the test data in the first CTE. When you try this solution, delete the CTE named inputs first, and use your actual table name in the rest of the query.
with
inputs ( location, parent ) as (
select 'A001' , 'Downstream' from dual union all
select 'A002' , 'A001' from dual union all
select 'A003' , 'A002' from dual union all
select 'A004' , 'A002' from dual union all
select 'A004B', 'A004' from dual union all
select 'B005' , 'Downstream' from dual
),
r ( lvl, location ) as (
select 1, location
from inputs
where parent = 'Downstream'
union all
select r.lvl + 1, i.location
from r join inputs i on r.location = i.parent
)
search depth first by lvl set ord
select lpad(' ', 2 * (lvl-1), ' ') || location as location
from r
order by ord
;
LOCATION
--------------------
A001
A002
A003
A004
A004B
B005
6 rows selected.
ADDED: It seems SQL Server doesn't have the search depth/breadth first clause for recursive CTE's (or perhaps the syntax is different). In any case, here is a primitive "manual" implementation of the same:
with ( ......... ),
r ( lvl, location, ord ) as (
select 1, location, location
from inputs
where parent = 'Downstream'
union all
select r.lvl + 1, i.location, r.location || '/' || i.location
from r join inputs i on r.location = i.parent
)
select lpad(' ', 2 * (lvl-1), ' ') || location as location
from r
order by ord
;