CREATE TABLE table_45134 ("Rider" TEXT, "Manufacturer" TEXT, "Laps" FLOAT, "Time/Retired" TEXT, "Grid" FLOAT)

What is the lowest laps that has a manufacturer of yamaha, and a time/retired of +1:08.312, and a grid less than 20?
SELECT MIN("Laps") FROM table_45134 WHERE "Manufacturer" = 'yamaha' AND "Time/Retired" = '+1:08.312' AND "Grid" < '20'
SELECT MIN("Laps") FROM "table_45134" WHERE "Grid" < '20' AND "Manufacturer" = 'yamaha' AND "Time/Retired" = '+1:08.312'