-- Database schema
| Document_Types : document_type_code [ TEXT ] primary_key , document_description [ TEXT ] | Documents : document_id [ INT ] primary_key , document_type_code [ TEXT ] Documents.document_type_code = Document_Types.document_type_code , grant_id [ INT ] Documents.grant_id = Grants.grant_id , sent_date [ TEXT ] , response_received_date [ TEXT ] , other_details [ TEXT ] | Grants : grant_id [ INT ] primary_key , organisation_id [ INT ] Grants.organisation_id = Organisations.organisation_id , grant_amount [ INT ] , grant_start_date [ TEXT ] , grant_end_date [ TEXT ] , other_details [ TEXT ] | Organisation_Types : organisation_type [ TEXT ] primary_key , organisation_type_description [ TEXT ] | Organisations : organisation_id [ INT ] primary_key , organisation_type [ TEXT ] Organisations.organisation_type = Organisation_Types.organisation_type , organisation_details [ TEXT ] | Project_Outcomes : project_id [ INT ] Project_Outcomes.project_id = Projects.project_id , outcome_code [ TEXT ] Project_Outcomes.outcome_code = Research_Outcomes.outcome_code , outcome_details [ TEXT ] | Project_Staff : staff_id [ INT ] primary_key , project_id [ INT ] Project_Staff.project_id = Projects.project_id , role_code [ TEXT ] Project_Staff.role_code = Staff_Roles.role_code , date_from [ TEXT ] , date_to [ TEXT ] , other_details [ TEXT ] | Projects : project_id [ INT ] primary_key , organisation_id [ INT ] Projects.organisation_id = Organisations.organisation_id , project_details [ TEXT ] | Research_Outcomes : outcome_code [ TEXT ] primary_key , outcome_description [ TEXT ] | Research_Staff : staff_id [ INT ] primary_key , employer_organisation_id [ INT ] Research_Staff.employer_organisation_id = Organisations.organisation_id , staff_details [ TEXT ] | Staff_Roles : role_code [ TEXT ] primary_key , role_description [ TEXT ] | Tasks : task_id [ INT ] primary_key , project_id [ INT ] Tasks.project_id = Projects.project_id , task_details [ TEXT ] , eg Agree Objectives [ TEXT ] |
-- -- What is the type and id of the organization that has the most research staff?

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;