关于 if条件 光标 循环的综合应用

 用PL/SQL语言编写一个程序，实现按部门分段（6000以上，3000-6000,3000以下）统计各工资段的职工人数 和工资总额（scott--emp)

 declare
     cursor cdeptno is select deptno from dept;
     cd dept.deptno%type;
     cursor cempno(ce number) is select empno,sal from emp where deptno=cd;
     ce emp.empno%type;
     cs emp.sal%type;
     sumsal number:=0;
     count3 number:=0;
     count36 number:=0;
     count6 number:=0;
 begin
     open cdeptno;
            dbms_output.put_line('部门'||'小于3000'||'3000-6000'||'大于6000'||'sumsal');
         loop
             fetch cdeptno into cd;
             exit when cdeptno%notfound;
                open cempno(cd);
                 sumsal :=0;
                 count3 :=0;
                 count36 :=0;
                 count6 :=0;
                 loop
                    fetch cempno into ce,cs;
                    exit when cempno%notfound;
                    if cs >=6000 then count6 :=count6+1;
                    elsif cs < 6000 and cs>=3000 then count36 :=count36+1;
                    elsif cs<3000 then
                     count3 :=count3+1;
                    end if;
                     sumsal :=sumsal + cs;
                 end loop;
                close cempno;
             dbms_output.put_line(cd||' '||count3||' '||count36||' '||count6||' '||sumsal);
         end loop;
     close cdeptno;
 end;
/