CREATE TABLE table_10945 ("Driver" TEXT, "Constructor" TEXT, "Laps" FLOAT, "Time/Retired" TEXT, "Grid" FLOAT)

Tell me the total number of Grid for Rubens Barrichello
SELECT COUNT("Grid") FROM table_10945 WHERE "Driver" = 'rubens barrichello'
SELECT COUNT("Grid") FROM "table_10945" WHERE "Driver" = 'rubens barrichello'