demonstrates the use of DBMS_UTILITY.TABLE_TO_COMMA and DBMS_UTILITY.COMMA_TO_TABLE.
SQL>
SQL> set serveroutput on
SQL>
SQL> DECLARE
2 v_InitialString VARCHAR2(100) := 'Alpha, Bravo, Charlie, Delta, Epsilon, Frank, George';
3 v_Table DBMS_UTILITY.UNCL_ARRAY;
4 v_FinalString VARCHAR2(100);
5 v_TabLen BINARY_INTEGER;
6 BEGIN
7 DBMS_OUTPUT.PUT_LINE('Initial string: ' || v_InitialString);
8 DBMS_UTILITY.COMMA_TO_TABLE(v_InitialString, v_TabLen, v_Table);
9 DBMS_OUTPUT.PUT_LINE('Table (length = ' || v_TabLen || '):');
10 FOR v_Count IN 1..v_Table.COUNT LOOP
11 DBMS_OUTPUT.PUT_LINE(v_Table(v_Count));
12 END LOOP;
13 DBMS_UTILITY.TABLE_TO_COMMA(v_Table, v_TabLen, v_FinalString);
14 DBMS_OUTPUT.PUT_LINE('Final string (length = ' || v_TabLen || '):');
15 DBMS_OUTPUT.PUT_LINE(v_FinalString);
16 END;
17 /
Initial string: Alpha, Bravo, Charlie, Delta, Epsilon, Frank, George
Table (length = 7):
Alpha
Bravo
Charlie
Delta
Epsilon
Frank
George
Final string (length = 7):
Alpha, Bravo, Charlie, Delta, Epsilon, Frank, George
PL/SQL procedure successfully completed.
SQL>