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WITH t AS
(
SELECT 1322049461 a FROM dual
UNION ALL
SELECT 1322041123 FROM dual
UNION ALL
SELECT 1322049461 FROM dual
)
--9i
SELECT max(substr(sys_connect_by_path(a,','),2)) b
FROM
(SELECT a,row_number() over(ORDER by a) rn FROM t)
START WITH rn=1 CONNECT BY rn-1=PRIOR rn
--10g
select wm_concat(a,',') from t
SELECT b FROM
(
SELECT substr(a,LEVEL,1) b FROM
(
SELECT '1,2,3,4'||',' a FROM dual
) CONNECT BY LEVEL<length(a)
)WHERE b<>','
--result:
1
2
3
4