Question: Which company started the earliest the maintenance contract? Show the company name.
Schema: create table third_party_companies (company_name varchar, company_id varchar, PRIMARY KEY (company_name)); create table maintenance_contracts (maintenance_contract_company_id varchar, contract_start_date varchar, PRIMARY KEY (maintenance_contract_company_id))
SQL: 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 limit 1