-- Database schema
| businesses : business_id [ INTEGER ] primary_key , name [ TEXT ] , address [ TEXT ] , city [ TEXT ] , postal_code [ TEXT ] , latitude [ REAL ] , longitude [ REAL ] , phone_number [ INTEGER ] , tax_code [ TEXT ] , business_certificate [ INTEGER ] , application_date [ DATE ] , owner_name [ TEXT ] , owner_address [ TEXT ] , owner_city [ TEXT ] , owner_state [ TEXT ] , owner_zip [ TEXT ] | inspections : business_id [ INTEGER ] inspections.business_id = businesses.business_id , score [ INTEGER ] , date [ DATE ] , type [ TEXT ] | violations : business_id [ INTEGER ] violations.business_id = businesses.business_id , date [ DATE ] , violation_type_id [ TEXT ] , risk_category [ TEXT ] , description [ TEXT ] |
-- -- Give the name of the business which met all the required standards during the unscheduled routine inspection on 2016/9/28.

SELECT T2.name FROM inspections AS T1 INNER JOIN businesses AS T2 ON T1.business_id = T2.business_id WHERE T1.score = 100 AND T1.`date` = '2016-09-28' AND T1.type = 'Routine - Unscheduled';