Cela devrait vous rapprocher... Mais je dois avouer que je ne comprends pas bien la logique... Pourquoi y a-t-il en 9401/Acc12 le "HasChild" mis à 1 ?
Essayez avec ça. La numérotation est partitionnée par le SourceCast. Cela signifie que les deux ensembles (ou plusieurs ensembles sont traités comme un ensemble chacun, selon le SourceCast. De plus, il existe un ID en cours d'exécution, comme dans votre exemple :
CREATE TABLE Account(AccountID NVARCHAR(50) NOT NULL
,AccountName NVARCHAR(50) NOT NULL
,SourceCast INTEGER NOT NULL
,PRIMARY KEY (AccountID,SourceCast));
INSERT INTO Account(AccountID,AccountName,SourceCast) VALUES (N'11',N'Acc11',9401);
INSERT INTO Account(AccountID,AccountName,SourceCast) VALUES (N'12',N'Acc12',9401);
INSERT INTO Account(AccountID,AccountName,SourceCast) VALUES (N'13',N'Acc13',9401);
INSERT INTO Account(AccountID,AccountName,SourceCast) VALUES (N'11/11',N'Acc11/11',9401);
INSERT INTO Account(AccountID,AccountName,SourceCast) VALUES (N'11/12',N'Acc11/12',9401);
INSERT INTO Account(AccountID,AccountName,SourceCast) VALUES (N'11/111',N'Acc11/111',9401);
INSERT INTO Account(AccountID,AccountName,SourceCast) VALUES (N'11/11/001',N'Acc11/11/001',9401);
INSERT INTO Account(AccountID,AccountName,SourceCast) VALUES (N'11/11/002',N'Acc11/11/002',9401);
INSERT INTO Account(AccountID,AccountName,SourceCast) VALUES (N'15',N'Acc15',9402);
INSERT INTO Account(AccountID,AccountName,SourceCast) VALUES (N'12',N'Acc12',9402);
INSERT INTO Account(AccountID,AccountName,SourceCast) VALUES (N'13',N'Acc13',9402);
INSERT INTO Account(AccountID,AccountName,SourceCast) VALUES (N'15/15',N'Acc15/15',9402);
INSERT INTO Account(AccountID,AccountName,SourceCast) VALUES (N'15/12',N'Acc15/12',9402);
INSERT INTO Account(AccountID,AccountName,SourceCast) VALUES (N'15/111',N'Acc15/111',9402);
INSERT INTO Account(AccountID,AccountName,SourceCast) VALUES (N'15/15/001',N'Acc15/15/001',9402);
INSERT INTO Account(AccountID,AccountName,SourceCast) VALUES (N'15/15/002',N'Acc15/15/002',9402);
GO
WITH DistinctSourceCasts AS (SELECT DISTINCT SourceCast FROM Account)
SELECT *
INTO #tempHierarchy
FROM
(
SELECT SourceCast
,CAST(SourceCast AS NVARCHAR(50)) AS AccountID
,CAST(SourceCast AS NVARCHAR(50)) AS AccountName
,0 AS ID
,0 AS HierarchyLevel
,'' AS ParentPath
,'' AS ownID
,'' AS ancestorID
FROM DistinctSourceCasts
UNION ALL
SELECT SourceCast
,AccountID
,AccountName
,ROW_NUMBER() OVER(PARTITION BY SourceCast ORDER BY LEN(AccountID)-LEN(REPLACE(AccountID,'/','')),AccountID) AS ID
,Extended.HierarchyLevel
,STUFF(
(
SELECT '/' + A.B.value('.','varchar(10)')
FROM Extended.IDsXML.nodes('/x[position() <= sql:column("HierarchyLevel")]') AS A(B)
FOR XML PATH('')
),1,2,'') AS ParentPath
,Extended.IDsXML.value('/x[sql:column("HierarchyLevel")+1][1]','varchar(10)') AS ownID
,Extended.IDsXML.value('/x[sql:column("HierarchyLevel")][1]','varchar(10)') AS ancestorID
FROM Account
CROSS APPLY(SELECT LEN(AccountID)-LEN(REPLACE(AccountID,'/','')) + 1 AS HierarchyLevel
,CAST('<x></x><x>' + REPLACE(AccountID,'/','</x><x>') + '</x>' AS XML) AS IDsXML) AS Extended
) AS tbl;
UPDATE #tempHierarchy SET ParentPath = SourceCast,ancestorID=SourceCast WHERE HierarchyLevel=1;
UPDATE #tempHierarchy SET ownID=SourceCast WHERE HierarchyLevel=0;
WITH RecursiveCTE AS
(
SELECT th.*
,CAST(NULL AS BIGINT) AS ParentID
,CASE WHEN EXISTS(SELECT 1 FROM #tempHierarchy AS x WHERE x.ParentPath=th.AccountID) THEN 1 ELSE 0 END AS HasChild
FROM #tempHierarchy AS th WHERE th.HierarchyLevel=0
UNION ALL
SELECT r.SourceCast
,sa.AccountID
,sa.AccountName
,sa.ID
,sa.HierarchyLevel
,sa.ParentPath
,sa.ownID
,sa.ancestorID
,(SELECT x.ID FROM #tempHierarchy AS x WHERE x.AccountID=sa.ParentPath)
,CASE WHEN EXISTS(SELECT 1 FROM #tempHierarchy AS x WHERE x.ParentPath=sa.AccountID) THEN 1 ELSE 0 END AS HasChild
FROM RecursiveCTE AS r
INNER JOIN #tempHierarchy AS sa ON sa.HierarchyLevel=r.HierarchyLevel+1
AND r.AccountID=sa.ParentPath
AND r.SourceCast=sa.SourceCast
)
SELECT SourceCast
,r.AccountID
,r.AccountName
,ROW_NUMBER() OVER(ORDER BY SourceCast,HierarchyLevel,ParentID,ID) AS ID
,r.ID AS GroupedID
,r.ParentID
,r.HierarchyLevel
,r.HasChild
FROM RecursiveCTE AS r
DROP TABLE #tempHierarchy;
Le résultat :
+------------+-----------+--------------+----+-----------+----------+----------------+----------+
| SourceCast | AccountID | AccountName | ID | GroupedID | ParentID | HierarchyLevel | HasChild |
+------------+-----------+--------------+----+-----------+----------+----------------+----------+
| 9401 | 9401 | 9401 | 1 | 0 | NULL | 0 | 1 |
+------------+-----------+--------------+----+-----------+----------+----------------+----------+
| 9401 | 11 | Acc11 | 2 | 1 | 0 | 1 | 1 |
+------------+-----------+--------------+----+-----------+----------+----------------+----------+
| 9401 | 12 | Acc12 | 3 | 2 | 0 | 1 | 0 |
+------------+-----------+--------------+----+-----------+----------+----------------+----------+
| 9401 | 13 | Acc13 | 4 | 3 | 0 | 1 | 0 |
+------------+-----------+--------------+----+-----------+----------+----------------+----------+
| 9401 | 11/11 | Acc11/11 | 5 | 4 | 1 | 2 | 1 |
+------------+-----------+--------------+----+-----------+----------+----------------+----------+
| 9401 | 11/111 | Acc11/111 | 6 | 5 | 1 | 2 | 0 |
+------------+-----------+--------------+----+-----------+----------+----------------+----------+
| 9401 | 11/12 | Acc11/12 | 7 | 6 | 1 | 2 | 0 |
+------------+-----------+--------------+----+-----------+----------+----------------+----------+
| 9401 | 11/11/001 | Acc11/11/001 | 8 | 7 | 4 | 3 | 0 |
+------------+-----------+--------------+----+-----------+----------+----------------+----------+
| 9401 | 11/11/002 | Acc11/11/002 | 9 | 8 | 4 | 3 | 0 |
+------------+-----------+--------------+----+-----------+----------+----------------+----------+
| 9402 | 9402 | 9402 | 10 | 0 | NULL | 0 | 1 |
+------------+-----------+--------------+----+-----------+----------+----------------+----------+
| 9402 | 12 | Acc12 | 11 | 1 | 0 | 1 | 0 |
+------------+-----------+--------------+----+-----------+----------+----------------+----------+
| 9402 | 13 | Acc13 | 12 | 2 | 0 | 1 | 0 |
+------------+-----------+--------------+----+-----------+----------+----------------+----------+
| 9402 | 15 | Acc15 | 13 | 3 | 0 | 1 | 1 |
+------------+-----------+--------------+----+-----------+----------+----------------+----------+
| 9402 | 15/111 | Acc15/111 | 14 | 4 | 3 | 2 | 0 |
+------------+-----------+--------------+----+-----------+----------+----------------+----------+
| 9402 | 15/12 | Acc15/12 | 15 | 5 | 3 | 2 | 0 |
+------------+-----------+--------------+----+-----------+----------+----------------+----------+
| 9402 | 15/15 | Acc15/15 | 16 | 6 | 3 | 2 | 1 |
+------------+-----------+--------------+----+-----------+----------+----------------+----------+
| 9402 | 15/15/001 | Acc15/15/001 | 17 | 7 | 6 | 3 | 0 |
+------------+-----------+--------------+----+-----------+----------+----------------+----------+
| 9402 | 15/15/002 | Acc15/15/002 | 18 | 8 | 6 | 3 | 0 |
+------------+-----------+--------------+----+-----------+----------+----------------+----------+
