How to replace comma separated text values in a column in Oracle? - sql

Question

I have a table t1 with a varchar col V_RELNIST_SKEY which contains comma separated numbers between 1 and 12 as shown. I want to write a select statement to replace numbers by string. For e.g., value 5,6 should be replaced by five,six and so on.
|V_RELNIST_SKEY|
|6 |
|5,6 |
|1,12 |
|1,2,3,12 |

Answer 1

Oracle Setup:
CREATE TABLE test_data ( value ) as
SELECT '9' FROM DUAL UNION ALL
SELECT '6' FROM DUAL UNION ALL
SELECT '1' FROM DUAL UNION ALL
SELECT '2,3' FROM DUAL UNION ALL
SELECT '5,6,7' FROM DUAL UNION ALL
SELECT '8,4' FROM DUAL UNION ALL
SELECT '1,2,3,4,5,6,7,8,9,10,11,12' FROM DUAL;
Query:
SELECT value,
column_value AS words
FROM test_data t
CROSS JOIN
TABLE(
CAST(
MULTISET(
SELECT LISTAGG(
TO_CHAR(
TO_DATE(
REGEXP_SUBSTR( t.value, '\d+', 1, LEVEL ),
'J'
),
'JSP'
),
','
) WITHIN GROUP ( ORDER BY LEVEL )
FROM DUAL
CONNECT BY LEVEL <= REGEXP_COUNT( t.value, '\d+' )
) AS SYS.ODCIVARCHAR2LIST
)
) w;
Output:
VALUE WORDS
-------------------------- ----------------------------------------
9 NINE
6 SIX
1 ONE
2,3 TWO,THREE
5,6,7 FIVE,SIX,SEVEN
8,4 EIGHT,FOUR
1,2,3,4,5,6,7,8,9,10,11,12 ONE,TWO,THREE,FOUR,FIVE,SIX,SEVEN,EIGHT,
NINE,TEN,ELEVEN,TWELVE
Update
What if I have to replace 1 with A, 2 with B, 3 with C and so on?
SELECT value,
COLUMN_VALUE AS words
FROM test_data t
CROSS JOIN
TABLE(
CAST(
MULTISET(
SELECT LISTAGG(
CHR( 64 + REGEXP_SUBSTR( t.value, '\d+', 1, LEVEL ) ),
','
) WITHIN GROUP ( ORDER BY LEVEL )
FROM DUAL
CONNECT BY LEVEL <= REGEXP_COUNT( t.value, '\d+' )
) AS SYS.ODCIVARCHAR2LIST
)
) w;
Output:
VALUE WORDS
-------------------------- ----------------------------------------
9 I
6 F
1 A
2,3 B,C
5,6,7 E,F,G
8,4 H,D
1,2,3,4,5,6,7,8,9,10,11,12 A,B,C,D,E,F,G,H,I,J,K,L