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Developer-C 11.1
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WITH t(id,col) AS ( SELECT 1,'1234567' FROM dual UNION ALL SELECT 2,'12345678' FROM dual ) SELECT id,LISTAGG( SUBSTR(col,1+(level-1)*2,2)|| CASE WHEN level < CEIL(LENGTH(col)/2) THEN CHR(TRUNC(DBMS_RANDOM.VALUE(33,48))) END) WITHIN GROUP (ORDER BY level) AS result FROM t GROUP BY id CONNECT BY level <= CEIL(LENGTH(col)/2) AND PRIOR SYS_GUID() IS NOT NULL AND PRIOR ID = ID
ID
RESULT
1
12*34&56.7
2
12#34!56-78