id,editor,examiner, approver,laboratory select u1.signature_url as writeUrl, u2.signature_url as examineUrl, u3.signature_url as ratifyUrl, u1.id as writeId, u2.id as examineId, u3.id as ratifyId from ins_report_approve_config irac left join user u1 on irac.editor=u1.id left join user u2 on irac.examiner=u2.id left join user u3 on irac.approver=u3.id where irac.laboratory = #{laboratory}