Context: CREATE TABLE bookings (customer_id VARCHAR); CREATE TABLE Customers (customer_id VARCHAR, first_name VARCHAR)
Question: How many bookings did each customer make? List the customer id, first name, and the count.
Answer: SELECT T1.customer_id, T1.first_name, COUNT(*) FROM Customers AS T1 JOIN bookings AS T2 ON T1.customer_id = T2.customer_id GROUP BY T1.customer_id