SQL Server rekursif diri bergabung

Cte rekursif untuk menyelamatkan....

Buat dan isi tabel sampel (Harap selamatkan kami langkah ini dalam pertanyaan Anda selanjutnya):

DECLARE @T as table
(
    id int,
    name varchar(100),
    parent_id int
)

INSERT INTO @T VALUES
(1, 'A', NULL),
(2, 'A.1', 1),
(3, 'A.2', 1),
(4, 'A.1.1', 2),
(5, 'B', NULL),
(6, 'B.1', 5),
(7, 'B.1.1', 6),
(8, 'B.2', 5),
(9, 'A.1.1.1', 4),
(10, 'A.1.1.2', 4)

Cte:

;WITH CTE AS
(
    SELECT id, name, name as path, parent_id
    FROM @T 
    WHERE parent_id IS NULL
    UNION ALL
    SELECT t.id, t.name, cast(cte.path +','+ t.name as varchar(100)), t.parent_id
    FROM @T t
    INNER JOIN CTE ON t.parent_id = CTE.id
)

Kueri:

SELECT id, name, path
FROM CTE

Hasil:

id      name        path
1       A           A
5       B           B
6       B.1         B,B.1
8       B.2         B,B.2
7       B.1.1       B,B.1,B.1.1
2       A.1         A,A.1
3       A.2         A,A.2
4       A.1.1       A,A.1,A.1.1
9       A.1.1.1     A,A.1,A.1.1,A.1.1.1
10      A.1.1.2     A,A.1,A.1.1,A.1.1.2

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