please help ( database )

Assignment 5 PL/SQL Assignment 2 Notice: be sure to execute the following command before you start working on the following questions. set serveroutput on; 1. Re-do the question 4 of the PL/SQL Assignement 1 by using loop control. Hint: consider using VARRAY. For example DECLARE type gradeCount is varray(5) of integer; gdcnt gradeCount; type grade is varray(5) of char(1); gd grade; BEGIN gdcnt := gradeCount(0,0,0,0,0); gd := grade(A, B, C, D, F); END; 2. Type the following anonymous block and execute it. DECLARE sm binary_integer :=0; i binary_integer :=0; BEGIN loop i := i + 1; if i > 10 then exit; end if; sm := sm + i; end loop; dbms_output.put_line('sum= ' || sm || '.'); END; 3. Revise the above program by using for loop and while loop respectively, and execute them. The revised program should have the same result as the above program.