How to replace null values with a text?

Question

I need to display Employee last_name and their commission amount from employees table in Oracle SQL, but the condition is if it encounter NULL valu

Answer 1

For Oracle

select last_name, nvl(commission_pct,'No Commission')
from employees;

For SQL

select last_name, isnull(commission_pct,"No Commission") as commission_pct
    from employees;