CREATE TABLE table_68399 ("Year" FLOAT, "Entrant" CLOB, "Chassis" CLOB, "Engine" CLOB, "Points" FLOAT)

Which engine of bmw had the lowest points and chassis of march 792 that is newer than 1979?
SELECT MIN("Points") FROM table_68399 WHERE "Engine" = 'bmw' AND "Chassis" = 'march 792' AND "Year" > '1979'
SELECT MIN("Points") FROM "table_68399" WHERE "Chassis" = 'march 792' AND "Engine" = 'bmw' AND "Year" > '1979'