Context: CREATE TABLE member (member_name VARCHAR); CREATE TABLE party_events (member_in_charge_id VARCHAR); CREATE TABLE member (member_name VARCHAR, member_id VARCHAR)
Question: Show all member names who are not in charge of any event.
Answer: SELECT member_name FROM member EXCEPT SELECT T1.member_name FROM member AS T1 JOIN party_events AS T2 ON T1.member_id = T2.member_in_charge_id