human
Schema:
Customers (Customer_ID, Customer_Details)
Staff (Staff_ID, Staff_Details)
Policies (Policy_ID, Customer_ID, Policy_Type_Code, Start_Date, End_Date)
Claim_Headers (Claim_Header_ID, Claim_Status_Code, Claim_Type_Code, Policy_ID, Date_of_Claim, Date_of_Settlement, Amount_Claimed, Amount_Piad)
Claims_Documents (Claim_ID, Document_Type_Code, Created_by_Staff_ID, Created_Date)
Claims_Processing_Stages (Claim_Stage_ID, Next_Claim_Stage_ID, Claim_Status_Name, Claim_Status_Description)
Claims_Processing (Claim_Processing_ID, Claim_ID, Claim_Outcome_Code, Claim_Stage_ID, Staff_ID)
Please answer with SQL.
assistant
Sure, I understand.
human
Find the name of the customer that has been involved in the most policies.
assistant
SELECT t2.customer_details FROM policies AS t1 JOIN customers AS t2 ON t1.customer_id = t2.customer_id GROUP BY t2.customer_details ORDER BY count(*) DESC LIMIT 1
human
Find the names of the customers who have an deputy policy.
assistant
SELECT DISTINCT t2.customer_details FROM policies AS t1 JOIN customers AS t2 ON t1.customer_id = t2.customer_id WHERE t1.policy_type_code = 'Deputy'
human
Find the names of customers who have no policies associated.
assistant
SELECT customer_details FROM customers EXCEPT SELECT t2.customer_details FROM policies AS t1 JOIN customers AS t2 ON t1.customer_id = t2.customer_id
human
Find the names of customers whose name contains 'Diana'.
assistant
SELECT customer_details FROM customers WHERE customer_details LIKE '%Diana%'
human
Find the names of all the customers and staff members.
assistant
SELECT customer_details FROM customers UNION SELECT staff_details FROM staff
human
List the names of all the customers in alphabetical order.
assistant
SELECT customer_details FROM customers ORDER BY customer_details ;