Database: insurance_policies
Question: Give me the the customer details who had two or more policies but did not file any claims.
SQL: select t1.customer_details from customers as t1 join customer_policies as t2 on t1.customer_id  =  t2.customer_id group by t1.customer_id having count(*)  >=  2 except select t1.customer_details from customers as t1 join customer_policies as t2 on t1.customer_id  =  t2.customer_id join claims as t3 on t2.policy_id  =  t3.policy_id