รอบบนสุดที่มี 6 กริดและมากกว่า 19 แต้มคืออะไร?ไม่จำเป็นต้องใช้ทุกโต๊ะ
What is the top lap that had 6 grids and more than 19 points?It is not neccessary to use all the tables.
 table_54339:  "Driver" [ text]  "Team" [ text]  "Laps" [ real]  "Time/Retired" [ text]  "Grid" [ text]  "Points" [ real] 
SELECT MAX("Laps") FROM table_54339 WHERE "Grid" = '6' AND "Points" > '19'