id, mt_company_id, contracts_id, code, description,before_content, after_content, operator_id, operate_date SELECT ch.id, ch.contracts_id, ch.code, ch.description, ch.before_content, ch.after_content, ch.operator_id, ch.operate_date, ui.name AS operatorName FROM contracts_history ch LEFT JOIN user_info ui ON ch.operator_id = ui.user_id WHERE contracts_id = #{contractId}