To get employee names starting with A or B listed in order:
select employee_name
from employees
where employee_name LIKE 'A%' OR employee_name LIKE 'B%'
order by employee_name
If you are using Microsoft SQL Server you could use:
....
where employee_name LIKE '[A-B]%'
order by employee_name
This isn't standard SQL however it simply gets meant the accompanying which is.
WHERE employee_name >= 'A'
AND employee_name < 'C'
For all variations you would have to consider whether you need to incorporate highlighted variations, for example, Á and test whether the questions above do what you need with these on your RDBMS and examination choices.
I hope this helps you.