มีกี่ทริปที่ไม่สิ้นสุดในซานฟรานซิสโก?ไม่จำเป็นต้องใช้ตารางทั้งหมด
How many trips did not end in San Francisco?It is not neccessary to use all the tables.
 station:  id [ number]  name [ text]  lat [ number]  long [ number]  dock_count [ number]  city [ text]  installation_date [ text] 
SELECT COUNT(*) FROM trip AS T1 JOIN station AS T2 ON T1.end_station_id = T2.id WHERE T2.city <> "San Francisco"