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Oracle Splitting Delimited Strings

Splitting Strings using a Hierarchical Query

Sample Data:


CREATE TABLE table_name ( id, list ) AS
SELECT 1, 'a,b,c,d' FROM DUAL UNION ALL -- Multiple items in the list
SELECT 2, 'e' FROM DUAL UNION ALL -- Single item in the list
SELECT 3, NULL FROM DUAL UNION ALL -- NULL list
SELECT 4, 'f,,g' FROM DUAL; -- NULL item in the list

Query:


SELECT t.id,
 REGEXP_SUBSTR( list, '([^,]*)(,|$)', 1, LEVEL, NULL, 1 ) AS VALUE,
 LEVEL AS lvl
FROM table_name t
CONNECT BY
 id = PRIOR id
AND PRIOR SYS_GUID() IS NOT NULL
AND LEVEL < REGEXP_COUNT( list, '([^,]*)(,|$)' )

Output:


 ID ITEM LVL
---------- ------- ----------
1 a 1
1 b 2
1 c 3
1 d 4
2 e 1
3 (NULL) 1
4 f 1
4 (NULL) 2
4 g 3


Conclusion

In this page (written and validated by ) you learned about Oracle Splitting Delimited Strings . What's Next? If you are interested in completing Oracle tutorial, your next topic will be learning about: Oracle Splitting Strings using a PL SQL Function.



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