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CREATE TABLE TBL_IORELATE (ID, MainID, RelatedID) AS SELECT 1, 'I-225', 'I-20' FROM DUAL UNION ALL SELECT 2, 'I-225', 'I-35' FROM DUAL UNION ALL SELECT 3, 'I-225', 'I-300' FROM DUAL UNION ALL SELECT 4, 'I-410', 'I-20' FROM DUAL UNION ALL SELECT 5, 'I-410', 'I-50' FROM DUAL UNION ALL SELECT 6, 'I-300', 'I-95' FROM DUAL UNION ALL SELECT 7, 'I-455', 'I-300' FROM DUAL UNION ALL SELECT 8, 'I-20', 'I-390' FROM DUAL;
8 rows affected
SELECT id, LISTAGG(value, ',') WITHIN GROUP (ORDER BY value) AS io_related FROM ( SELECT DISTINCT id, value FROM ( SELECT CONNECT_BY_ROOT MainID AS id, MainID, RelatedID FROM TBL_IORELATE START WITH MainID IN ('I-225') CONNECT BY NOCYCLE PRIOR MainID = MainID OR PRIOR RelatedID = RelatedID ) UNPIVOT(value FOR key IN (MainID, RelatedID)) WHERE id <> value ) GROUP BY id
ID
IO_RELATED
I-225
I-20,I-300,I-35,I-410,I-455,I-50