Parcourir toutes les clés étrangères de la base de données et générer un chemin

Eh bien, en général, parce que vous ne pouvez pas utiliser les fonctions d'agrégation dans la partie récursive de CTE, vous devez déplacer la partie de concaténation de colonnes vers un autre CTE. Vous aurez :

    ;

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