Show me the names of companies that started the five earliest maintenance contracts.
select t1.company_name from third_party_companies as t1 join maintenance_contracts as t2 on t1.company_id = t2.maintenance_contract_company_id order by t2.contract_start_date asc limit 5
Show me the same for the earliest one.
select t1.company_name from third_party_companies as t1 join maintenance_contracts as t2 on t1.company_id = t2.maintenance_contract_company_id order by t2.contract_start_date asc limit 1