Context: CREATE TABLE Customers (customer_details VARCHAR, customer_id VARCHAR, Customer_id VARCHAR); CREATE TABLE Customer_Policies (Customer_id VARCHAR)
Question: Who are the customers that had more than 1 policy? List the customer details and id.
Answer: SELECT T1.customer_details, T1.customer_id FROM Customers AS T1 JOIN Customer_Policies AS T2 ON T1.Customer_id = T2.Customer_id GROUP BY T1.customer_id HAVING COUNT(*) > 1