CREATE TABLE table_51128 ("Week" FLOAT, "Date" CLOB, "Opponent" CLOB, "Result" CLOB, "Attendance" FLOAT)

On which week was the opponent the oakland raiders?
SELECT SUM("Week") FROM table_51128 WHERE "Opponent" = 'oakland raiders'
SELECT SUM("Week") FROM "table_51128" WHERE "Opponent" = 'oakland raiders'