Cte ricorsive in soccorso....
Crea e compila una tabella di esempio (Per favore salvaci questo passaggio nelle tue domande future):
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)
Il 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
)
La domanda:
SELECT id, name, path
FROM CTE
Risultati:
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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