DECLARE  
   TYPE t IS TABLE OF INTEGER  
      INDEX BY VARCHAR2 (3);  
  
   tt   t;  
BEGIN  
   FOR indx IN 1 .. 10  
   LOOP  
      tt (indx) := 100;  
   END LOOP;  
  
   DBMS_OUTPUT.put_line (tt.COUNT);  
   DBMS_OUTPUT.put_line (tt.FIRST);  
   DBMS_OUTPUT.put_line (tt.LAST);  
END;  
  
 

DECLARE  
   TYPE t IS TABLE OF INTEGER  
      INDEX BY VARCHAR2 (3);  
  
   tt   t;  
 
   l_index VARCHAR2 (3); 
BEGIN  
   FOR indx IN 1 .. 10  
   LOOP  
      tt (indx) := 100;  
   END LOOP;  
  
   l_index := tt.FIRST; 
 
   WHILE l_index IS NOT NULL 
   LOOP 
      DBMS_OUTPUT.put_line (l_index); 
      l_index := tt.NEXT (l_index); 
   END LOOP;  
END;