Da Sie im Allgemeinen keine Aggregatfunktionen im rekursiven Teil des CTE verwenden können, sollten Sie den Teil der Spaltenverkettung in einen anderen CTE verschieben. Sie haben:
;
WITH CTE_FKCols
AS (
SELECT FK.NAME
,'[' + STUFF((
SELECT ','
,object_name(Col.object_id) + '.' + col.NAME
FROM sys.foreign_key_columns C
INNER JOIN sys.columns Col ON Col.object_id = c.referenced_object_id
AND col.column_id = c.referenced_column_id
WHERE C.constraint_object_id = FK.object_id
FOR XML PATH('')
), 1, 1, '') + ']' Cols
FROM sys.foreign_keys FK
)
,CTE
AS (
SELECT fk.create_date
,fk.modify_date
,fkc.constraint_object_id AS ConstraintId
,OBJECT_NAME(fkc.constraint_object_id) AS ConstraintName
--, fkc.referenced_object_id AS PrimaryKeyTableId
,OBJECT_NAME(fkc.referenced_object_id) AS PrimaryKeyTableName
--, fkc.referenced_column_id AS PrimaryKeyColumnId
,OBJECT_NAME(fk.parent_object_id) AS ForeignKeyTableName
FROM sys.foreign_key_columns fkc
INNER JOIN sys.foreign_keys fk ON fk.OBJECT_ID = fkc.constraint_object_id
)
,cte2 (
create_date
,modify_date
,ConstraintName
,PrimaryKeyTableName
,ForeignKeyTableName
,Hops
,path
)
AS (
SELECT create_date
,modify_date
,ConstraintName
,PrimaryKeyTableName
,ForeignKeyTableName
,1
,CAST((
SELECT F.Cols
FROM CTE_FKCols F
WHERE F.NAME = cte.ConstraintName
) AS NVARCHAR(4000))
FROM cte
UNION ALL
SELECT cte.create_date
,cte.modify_date
,cte.ConstraintName
,cte.PrimaryKeyTableName
,cte.ForeignKeyTableName
,cte2.Hops + 1
,CAST((
cte2.path + CAST('-> ' AS NVARCHAR(4000)) + (
SELECT F.Cols
FROM CTE_FKCols F
WHERE F.NAME = cte.ConstraintName
)
) AS NVARCHAR(4000))
FROM cte2
INNER JOIN cte ON cte2.ForeignKeyTableName = cte.PrimaryKeyTableName
AND cte2.PrimaryKeyTableName != cte.PrimaryKeyTableName --Remove self-reference
)
SELECT *
FROM cte2
