Show me the name of all the customers.
select first_name, last_name from customers
What about those good customers?
select first_name, last_name from customers where good_or_bad_customer = 'good'
Also show me their genders.
select first_name, last_name, gender_mf from customers where good_or_bad_customer = 'good'
Order them by their last name.
select first_name, last_name, gender_mf from customers where good_or_bad_customer = 'good' order by last_name