จำนวนกริดทั้งหมดสำหรับ peter gethin คือเท่าไร?ไม่จำเป็นต้องใช้ตารางทั้งหมด
What is the total number of grids for peter gethin?It is not neccessary to use all the tables.
 table_78426:  "Driver" [ text]  "Constructor" [ text]  "Laps" [ real]  "Time/Retired" [ text]  "Grid" [ real] 
SELECT SUM("Grid") FROM table_78426 WHERE "Driver" = 'peter gethin'