How many customers have the first name Eduardo and last name Martins?
select count(*) from customers where first_name = "Eduardo" and last_name = "Martins";
Show me all his customer information!
select * from customers where first_name = "Eduardo" and last_name = "Martins";
Just show the company!
select company from customers where first_name = "Eduardo" and last_name = "Martins";