คู่ต่อสู้ของ Oakland Raiders คือสัปดาห์ใด?ไม่จำเป็นต้องใช้โต๊ะทั้งหมด
On which week was the opponent the oakland raiders?It is not neccessary to use all the tables.
 table_name_91:  (week [ INTEGER ] opponent [ VARCHAR) ]
SELECT SUM(week) FROM table_name_91 WHERE opponent = "oakland raiders"