Show all member names who are not in charge of any event.
create table member (member_name varchar, PRIMARY KEY (member_name)); create table party_events (member_in_charge_id varchar, PRIMARY KEY (member_in_charge_id)); create table member (member_name varchar, member_id varchar, PRIMARY KEY (member_name))
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