Roy Salvadori ขับรถให้กับ David Brown Corporation ในรอบใด?ไม่จำเป็นต้องใช้ตารางทั้งหมด
What rounds did Roy Salvadori drive for David Brown Corporation?It is not neccessary to use all the tables.
 table_name_98:  (rounds [ VARCHAR ] entrant [ VARCHAR ] driver [ VARCHAR) ]
SELECT rounds FROM table_name_98 WHERE entrant = "david brown corporation" AND driver = "roy salvadori"