When did Renaldi's Pizza had its first inspection?
Renaldi's Pizza refers to dba_name = 'RENALDI''S PIZZA'; first inspection refers to min(inspection_date)
SELECT MIN(T2.inspection_date) FROM establishment AS T1 INNER JOIN inspection AS T2 ON T1.license_no = T2.license_no WHERE T1.dba_name = 'RENALDI''S PIZZA'