SQL & PL/SQL

Hi everyone,

I am new to the concept of pseudo functiona and was just trying to use the multiset union function. I have written a cursor which gives me a column 'buyer' and a corresponding dataset. Now my dilemna is how to refer the elements in the dataset using the cursor. Could anyone please help?

CREATE TABLE BUYER
(
  BUYER        NUMBER(4)                        NOT NULL,
  BUYER_NAME   VARCHAR2(120 BYTE)               NOT NULL,
  BUYER_PHONE  VARCHAR2(20 BYTE),
  BUYER_FAX    VARCHAR2(20 BYTE)
);

SET DEFINE OFF;
Insert into RMS.BUYER
   (BUYER, BUYER_NAME, BUYER_PHONE, BUYER_FAX)
 Values
   (110, 'Kendr', '5147, 876', NULL);
Insert into RMS.BUYER
   (BUYER, BUYER_NAME, BUYER_PHONE, BUYER_FAX)
 Values
   (101, 'Amelie Dube', '(514),808', NULL);
Insert into RMS.BUYER
   (BUYER, BUYER_NAME, BUYER_PHONE, BUYER_FAX)
 Values
   (102, 'Jennifer Baie', '51962,860', NULL);
Insert into RMS.BUYER
   (BUYER, BUYER_NAME, BUYER_PHONE, BUYER_FAX)
 Values
   (103, 'Loriannstris', '5333962,785', NULL);
Insert into RMS.BUYER
   (BUYER, BUYER_NAME, BUYER_PHONE, BUYER_FAX)
 Values
   (104, 'Sandra St-re', '513962,736', NULL);

COMMIT;
--------------------------------------------------------------------------------------------------------------
create or replace type tab1 is table of varchar2 (30);     
--------------------------------------------------------------------------------------------------------------      
DECLARE
cursor c1 is
select buyer,
      CAST (multiset(select buyer_name from buyer where rownum<4) as tab1) as data1
      from buyer 
MULTISET UNION ALL
select  buyer,
          CAST(multiset(select buyer_name from buyer where rownum<5) as tab1) as data2
from buyer;

BEGIN
  for c_rec in c1
    loop
      DBMS_OUTPUT.PUT_LINE(c_rec.buyer||'~'||c_rec.column_value(1)); --  i want to print all the values in the 'data set' along with the buyer id.
   end loop;
end;

error:
PLS-00302: component 'COLUMN_VALUE' must be declared