Find the ids of the problems that are reported by the staff whose last name is Bosco.
create table problems (problem_id varchar, reported_by_staff_id varchar, PRIMARY KEY (problem_id)); create table staff (staff_id varchar, staff_last_name varchar, PRIMARY KEY (staff_id))
select t1.problem_id from problems as t1 join staff as t2 on t1.reported_by_staff_id = t2.staff_id where t2.staff_last_name = "bosco"