Question: Which organisation type hires most research staff?
Schema: create table research_staff (employer_organisation_id varchar, PRIMARY KEY (employer_organisation_id)); create table organisations (organisation_type varchar, organisation_id varchar, PRIMARY KEY (organisation_type))
SQL: select t1.organisation_type from organisations as t1 join research_staff as t2 on t1.organisation_id = t2.employer_organisation_id group by t1.organisation_type order by count(*) desc limit 1