SQL - Membuat asosiasi antar bidang (Hubungan transitif)

Yah saya tidak bisa mengatakan apa-apa untuk ORACLE, tetapi Anda bisa mengelolanya dengan CTE rekursif di server sql. Inilah contoh solusi saya, ini melakukan apa yang Anda minta dengan asumsi bahwa Anda memiliki tabel penyihir peta hubungan banyak-ke-banyak dari satu tabel ke tabel itu sendiri

DECLARE @testData table (EntityID int, EntityName varchar(1))
DECLARE @EntityRelations table (EntityID1 int, EntityID2 int)

INSERT INTO @testData
SELECT 1, 'A'
UNION
SELECT 2, 'B'
UNION
SELECT 3, 'C'
UNION
SELECT 4, 'D'
UNION
SELECT 5, 'E'
UNION
SELECT 6, 'F'
UNION
SELECT 7, 'G'
UNION
SELECT 8, 'Y'
UNION
SELECT 9, 'Z'

INSERT INTO @EntityRelations
SELECT 1, 2
UNION
SELECT 9, 2
UNION
SELECT 8, 2
UNION
SELECT 2, 3
UNION
SELECT 2, 4
UNION
SELECT 4, 5
UNION
SELECT 6, 7;


WITH Affiliations (EntityID, Entity1Name, Entity2Name) AS
(
    SELECT r.EntityID1
          ,e.EntityName as Entity1Name
          ,e2.EntityName as Entity2Name
    FROM @EntityRelations r
        JOIN @testData e ON e.EntityID = r.EntityID1
        JOIN @testData e2 ON e2.EntityID = r.EntityID2

    UNION ALL

    SELECT r.EntityID1
          ,e.EntityName as Entity1Name
          ,e2.EntityName as Entity2Name
    FROM @EntityRelations r
        JOIN @testData e ON e.EntityID = r.EntityID1
        JOIN @testData e2 ON e2.EntityID = r.EntityID2
        JOIN Affiliations a ON a.EntityID = r.EntityID2
)

,AffiliationsReverse (EntityID, Entity1Name, Entity2Name) AS
(
    SELECT r.EntityID2
          ,e.EntityName as Entity1Name
          ,e2.EntityName as Entity2Name
    FROM @EntityRelations r
        JOIN @testData e ON e.EntityID = r.EntityID1
        JOIN @testData e2 ON e2.EntityID = r.EntityID2

    UNION ALL

    SELECT r.EntityID2
          ,e.EntityName as Entity1Name
          ,e2.EntityName as Entity2Name
    FROM @EntityRelations r
        JOIN @testData e ON e.EntityID = r.EntityID1
        JOIN @testData e2 ON e2.EntityID = r.EntityID2
        JOIN AffiliationsReverse a ON a.EntityID = r.EntityID1
)


SELECT DISTINCT EntityName
FROM
(
SELECT a.Entity1Name AS EntityName
FROM Affiliations a
    JOIN AffiliationsReverse ar ON ar.EntityID = a.EntityID

UNION

SELECT a.Entity2Name AS EntityName
FROM Affiliations a
    JOIN AffiliationsReverse ar ON ar.EntityID = a.EntityID

UNION

SELECT ar.Entity1Name AS EntityName
FROM Affiliations a
    JOIN AffiliationsReverse ar ON ar.EntityID = a.EntityID

UNION

SELECT ar.Entity2Name AS EntityName
FROM Affiliations a
    JOIN AffiliationsReverse ar ON ar.EntityID = a.EntityID


) s