Context: CREATE TABLE Engineer_Visits (contact_staff_id VARCHAR); CREATE TABLE Staff (staff_name VARCHAR, staff_id VARCHAR); CREATE TABLE Fault_Log (recorded_by_staff_id VARCHAR)
Question: What is the name and id of the staff who recorded the fault log but has not contacted any visiting engineers?
Answer: SELECT T1.staff_name, T1.staff_id FROM Staff AS T1 JOIN Fault_Log AS T2 ON T1.staff_id = T2.recorded_by_staff_id EXCEPT SELECT T3.staff_name, T3.staff_id FROM Staff AS T3 JOIN Engineer_Visits AS T4 ON T3.staff_id = T4.contact_staff_id