มีกี่ประตูที่ทำคะแนนได้เมื่อคะแนนน้อยกว่า 13, ชัยชนะน้อยกว่า 3 และประตูน้อยกว่า 15? ไม่จำเป็นที่จะต้องใช้ตารางทั้งหมด
How many goals against were scored when the points were smaller than 13, the wins were smaller than 3, and the goals for were smaller than 15?It is not neccessary to use all the tables.
 table_8677:  "Position" [ real]  "Club" [ text]  "Played" [ real]  "Points" [ real]  "Wins" [ real]  "Draws" [ real]  "Losses" [ real] 
SELECT SUM("Goals against") FROM table_8677 WHERE "Points" < '13' AND "Wins" < '3' AND "Goals for" < '15'