Pengaturan Skema Oracle 11g R2 :
CREATE TABLE test (col1, col2, col3, col4, col5 ) AS
SELECT 1, 'A', 'B', 'C', 'D' FROM DUAL
UNION ALL SELECT 2, 'A', 'B', 'C', NULL FROM DUAL
UNION ALL SELECT 3, 'C', 'A', NULL, NULL FROM DUAL
UNION ALL SELECT 4, 'D', 'A', 'C', NULL FROM DUAL
UNION ALL SELECT 5, NULL, NULL, NULL, NULL FROM DUAL
UNION ALL SELECT 6, NULL, NULL, NULL, 'A' FROM DUAL
UNION ALL SELECT 7, 'B', NULL, NULL, 'A' FROM DUAL
UNION ALL SELECT 8, NULL, 'C', NULL, 'A' FROM DUAL;
Kueri 1 :
Jika tidak ada NULL nilai di antara nilai-nilai lain (ini akan memperkenalkan beberapa koma di baris 7 &8):
SELECT col1,
TRIM( ',' FROM col2||','||col3||','||col4||','||col5 ) AS col2
FROM test
Hasil :
| COL1 | COL2 |
|------|---------|
| 1 | A,B,C,D |
| 2 | A,B,C |
| 3 | C,A |
| 4 | D,A,C |
| 5 | (null) |
| 6 | A |
| 7 | B,,,A |
| 8 | C,,A |
Dua kueri terakhir akan berfungsi untuk semua contoh:
Kueri 2 :
SELECT col1,
TRIM( ',' FROM col2 || NVL2( col3, ','||col3, NULL ) || NVL2( col4, ','||col4, NULL ) || NVL2( col5, ','||col5, NULL ) ) AS col2
FROM test
Hasil :
| COL1 | COL2 |
|------|---------|
| 1 | A,B,C,D |
| 2 | A,B,C |
| 3 | C,A |
| 4 | D,A,C |
| 5 | (null) |
| 6 | A |
| 7 | B,A |
| 8 | C,A |
Kueri 3 :
SELECT col1,
REGEXP_REPLACE( col2||','||col3||','||col4||','||col5, '(^|,),+|,+($)', '\1' ) AS col2
FROM test
Hasil :
| COL1 | COL2 |
|------|---------|
| 1 | A,B,C,D |
| 2 | A,B,C |
| 3 | C,A, |
| 4 | D,A,C |
| 5 | (null) |
| 6 | A |
| 7 | B,A |
| 8 | C,A |
