The result of the function is a large integer. If the argument can be null, the result can be null; if the argument is null, the result is the null value.
Using the EMPLOYEE table, select a list containing salary (SALARY)
divided by education level (EDLEVEL). Truncate any decimal in the calculation.
The list should also contain the values used in the calculation and employee
number (EMPNO). The list should be in descending order of the calculated value: