SQL & PL/SQL :: Get Sum Amounts From Multiple Tables?

I have a primary table and some secondary tables. I need to use the key from Primary table and get the sum/totals from the other tables with a single query.

For example, I have 3 tables employee, employeesal and employeerewards in which employee is the primary table. I need to get the total salary for an employee from employeesal table and total rewards from the employeerewards table using one query.

I am pasting the test data below:

create table employee (eno number(9), ename varchar2(40));
insert into employee values(1,'Jack');
insert into employee values(2,'Jim');

[Code]....

I am looking for a better way of doing this in terms of performance. In my projecct, those 3 tables are very big tables and I doubt if I do two inner queries and then use a outer query may not be the best way to do it.

Is there any better way to write this query in terms of performance?