why cant i do this?? any clues on how i should go about

DECLARE
        v_userTabColumns INT;
BEGIN

     SELECT COUNT(*) INTO  v_userTabColumns
     FROM  USER_TAB_COLUMNS
     WHERE TABLE_NAME ='T'
           AND COLUMN_NAME ='ABCD';

     IF v_userTabColumns >0 THEN
        DBMS_OUTPUT.PUT_LINE ('<<ABCD>><<T>> already Exists');
     ELSE
        ALTER TABLE T   ADD (ABCD VARCHAR2(50));
        DBMS_OUTPUT.PUT_LINE ('New column <<ABCD>> for <<t>>
created.');
     END IF;
   

            

END; Received on Tue Aug 08 2006 - 11:42:30 CDT