SQL & PL/SQL :: Single Excel File For Emp Table Department Wise In Different Sheets Of Excel

I need to generate a single excel file which each department details in seperate sheets of the excel file, each sheet should ne named with department no (ex :Dept_10, Dept_20,Dept_30) and the main excel should be named as Emp_details.

Header row and total row should be in bold.I have created 3 individual excels thru toad and moved them to single excel and renamed the sheets.

Can we programatically do this thru SQL or PL/SQL, does Oracle provide any build packages for excel.As excel files cannot be uploaded,I am unable to upload the excel file I generated manually.

select to_char(empno) empno,ename,job,mgr,hiredate,
nvl(sal,0) sal,nvl(comm,0) comm,nvl(sal,0) + nvl(comm,0) "Total Income" ,deptno
from emp
where deptno = 10
union all
select 'Total',null,null,null,null,sum(nvl(sal,0)),sum(nvl(comm,0)),sum(nvl(sal,0))+sum(nvl(comm,0)),null
from emp
where deptno = 10;