Answer: Consider the error generated by the preceding script: table2 table_type2 := table_type2(varray1, varray_type1(8, 9, 0)); * ERROR at line 6: ORA-06550: line 6, column 26: PLS-00222: no function with name 'TABLE_TYPE2' exists in this scope ORA-06550: line 6, column 11: PL/SQL: Item ignored ORA-06550: line 9, column 44: PLS-00320: the declaration of the type of this expression is incomplete or malformed ORA-06550: line 9, column 4: PL/SQL: Statement ignored Notice that this error refers to the initialization of table2, which has been declared as an index-by table of varrays. You will recall that index-by tables are not initialized prior to their use. As a result, the declaration of table2 must be modified. Furthermore, additional assignment statement must be added to the executable portion of the block as follows: DECLARE TYPE varray_type1 IS VARRAY(7) OF INTEGER; TYPE table_type2 IS TABLE OF varray_type1 INDEX BY BINARY_INTEGER; varray1 varray_type1 := varray_type1(1, 2, 3); table2 table_type2; BEGIN -- These statements populate index-by table table2(1) := varray1; table2(2) := varray_type1(8, 9, 0); DBMS_OUTPUT.PUT_LINE ('table2(1)(2): '||table2(1)(2)); FOR i IN 1..10 LOOP varray1.EXTEND; varray1(i) := i; DBMS_OUTPUT.PUT_LINE ('varray1('||i||'): '|| varray1(i)); END LOOP; END; When run, this version produces a different error: table2(1)(2): 2 varray1(1): 1 varray1(2): 2 varray1(3): 3 varray1(4): 4 DECLARE * ERROR at line 1: ORA-06532: Subscript outside of limit ORA-06512: at line 14 Notice that this is a runtime error that refers to varray1. This error occurs because you are trying to extend varray beyond its limit. Varray1 can contain up to seven integers. After initialization, the varray contains three integers. As a result, it can be populated with no more than four additional integer numbers. So the fifth iteration of the loop tries to extend the varray to eight elements, which in turn causes a subscript beyond count error. It is important to note that there is no correlation between the loop counter and the EXTEND method. Every time the EXTEND method is called, it increases the size of the varray by one element. Since the varray has been initialized to three elements, the EXTEND method adds a fourth element to the array for the first iteration of the loop. At this same time, the first element of the varray is assigned a value of 1 via the loop counter. For the second iteration of the loop, the EXTEND method adds a fifth element to the varray while the second element is assigned a value of 2, and so forth. Finally, consider the error-free version of the script and its output: DECLARE TYPE varray_type1 IS VARRAY(7) OF INTEGER; TYPE table_type2 IS TABLE OF varray_type1 INDEX BY BINARY_INTEGER; varray1 varray_type1 := varray_type1(1, 2, 3); table2 table_type2; BEGIN -- These statements populate index-by table table2(1) := varray1; table2(2) := varray_type1(8, 9, 0); DBMS_OUTPUT.PUT_LINE ('table2(1)(2): '||table2(1)(2)); FOR i IN 4..7 LOOP varray1.EXTEND; varray1(i) := i; END LOOP; -- Display elements of the varray FOR i IN 1..7 LOOP DBMS_OUTPUT.PUT_LINE ('varray1('||i||'): '|| varray1(i)); END LOOP; END; table2(1)(2): 2 varray1(1): 1 varray1(2): 2 varray1(3): 3 varray1(4): 4 varray1(5): 5 varray1(6): 6 varray1(7): 7 PL/SQL procedure successfully completed. | 
