How many contact individuals does each organization have?
select count(*) from organizations as t1 join organization_contact_individuals as t2 on t1.organization_id = t2.organization_id
What is the name of organization that has the greatest number of contact individuals?
select t1.organization_name from organizations as t1 join organization_contact_individuals as t2 on t1.organization_id = t2.organization_id group by t1.organization_name order by count(*) desc limit 1