Give me the names of those customers
select T1.first_name, T1.last_name from customers as T1 join addresses as T2 on T2.address_id  =   T1.customer_address_id where T2.city  =   ( SELECT T2.city FROM Customers AS T1 JOIN Addresses AS T2 ON T1.customer_address_id  =  T2.address_id GROUP BY T2.city ORDER BY count ( * )  DESC LIMIT 1 ) 
names of the customers = T1.first_name, T1.last_name; conditions involving city with the highest number of customers = T2.city = (SELECT T2.city FROM Customers AS T1 JOIN Addresses AS T2 ON T1.customer_address_id = T2.address_id GROUP BY T2.city ORDER BY COUNT(*) DESC LIMIT 1);