คู่ต่อสู้ในสัปดาห์ที่ 4 คือใคร?ไม่จำเป็นต้องใช้ตารางทั้งหมด
Who was the opponent in week 4?It is not neccessary to use all the tables.
 table_19637:  "Week" [ real]  "Date" [ text]  "Opponent" [ text]  "Result" [ text]  "Record" [ text]  "Attendance" [ real] 
SELECT "Opponent" FROM table_19637 WHERE "Week" = '4'