Database: tracking_grants_for_research
Question: What is the organisation type and id of the organisation which has the most number of research staff?
SQL:
SELECT T1.organisation_type ,  T1.organisation_id FROM Organisations AS T1 JOIN Research_Staff AS T2 ON T1.organisation_id  =  T2.employer_organisation_id GROUP BY T1.organisation_id ORDER BY count(*) DESC LIMIT 1