Impostazione Oracle :
CREATE TABLE table_name ( Family_code, Parent_Family_Code ) AS
SELECT 1, 2 FROM DUAL UNION ALL
SELECT 2, 4 FROM DUAL UNION ALL
SELECT 3, 6 FROM DUAL UNION ALL
SELECT 6, NULL FROM DUAL UNION ALL
SELECT 4, 3 FROM DUAL UNION ALL
SELECT 4, 5 FROM DUAL UNION ALL
SELECT 5, NULL FROM DUAL UNION ALL
SELECT 8, 7 FROM DUAL UNION ALL
SELECT 7, 9 FROM DUAL UNION ALL
SELECT 9, 10 FROM DUAL UNION ALL
SELECT 10, 11 FROM DUAL UNION ALL
SELECT 11, NULL FROM DUAL;
Richiesta :
SELECT TO_NUMBER( REGEXP_SUBSTR( path, '/(\d+)', 1, max_depth, NULL, 1 ) ) AS family_code,
CASE WHEN max_depth > 1 THEN TO_NUMBER( REGEXP_SUBSTR( path, '/(\d+)', 1, max_depth - 1, NULL, 1 ) ) END AS p1,
CASE WHEN max_depth > 2 THEN TO_NUMBER( REGEXP_SUBSTR( path, '/(\d+)', 1, max_depth - 2, NULL, 1 ) ) END AS p2,
CASE WHEN max_depth > 3 THEN TO_NUMBER( REGEXP_SUBSTR( path, '/(\d+)', 1, max_depth - 3, NULL, 1 ) ) END AS p3,
CASE WHEN max_depth > 4 THEN TO_NUMBER( REGEXP_SUBSTR( path, '/(\d+)', 1, max_depth - 4, NULL, 1 ) ) END AS p4,
CASE WHEN max_depth > 5 THEN TO_NUMBER( REGEXP_SUBSTR( path, '/(\d+)', 1, max_depth - 5, NULL, 1 ) ) END AS p5,
CASE WHEN max_depth > 6 THEN TO_NUMBER( REGEXP_SUBSTR( path, '/(\d+)', 1, max_depth - 6, NULL, 1 ) ) END AS p6,
CASE WHEN max_depth > 7 THEN TO_NUMBER( REGEXP_SUBSTR( path, '/(\d+)', 1, max_depth - 7, NULL, 1 ) ) END AS p7,
CASE WHEN max_depth > 8 THEN TO_NUMBER( REGEXP_SUBSTR( path, '/(\d+)', 1, max_depth - 8, NULL, 1 ) ) END AS p8,
CASE WHEN max_depth > 9 THEN TO_NUMBER( REGEXP_SUBSTR( path, '/(\d+)', 1, max_depth - 9, NULL, 1 ) ) END AS p9,
CASE WHEN max_depth > 10 THEN TO_NUMBER( REGEXP_SUBSTR( path, '/(\d+)', 1, max_depth - 10, NULL, 1 ) ) END AS p10
FROM (
SELECT SYS_CONNECT_BY_PATH( Family_code, '/' ) AS path,
LEVEL AS max_depth
FROM table_name
WHERE CONNECT_BY_ISLEAF = 1
CONNECT BY PRIOR Family_Code = Parent_Family_Code
START WITH Parent_Family_Code IS NULL
);
Risultato :
FAMILY_CODE P1 P2 P3 P4 P5 P6 P7 P8 P9 P10
----------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ----------
1 2 4 5
1 2 4 3 6
8 7 9 10 11
