CREATE TABLE table_name_44 (grid INT, rider VARCHAR, manufacturer VARCHAR, laps VARCHAR)

What is the grid number of Sandro Cortese, who has Aprilia as the manufacturer and less than 19 laps?
SELECT SUM(grid) FROM table_name_44 WHERE manufacturer = "aprilia" AND laps < 19 AND rider = "sandro cortese"
SELECT SUM("grid") FROM "table_name_44" WHERE "aprilia" = "manufacturer" AND "laps" < 19 AND "rider" = "sandro cortese"