Assuming that we have 2 tables - customers and orders:

Which of the following queries is correct to count the customers who have put at least one order?

Assuming that we have 2 tables - customers and orders:

Assume also that we have 2 customers and the first customer has 3 orders and the second customer has 5 orders. How many rows will the following select query bring?

select * from customers join orders on orders.customer_id = customers.customer_id;

Match the database term to its correct definition