CREATE TABLE table_74983 ("Year" FLOAT, "Class" CLOB, "Team" CLOB, "Points" FLOAT, "Wins" FLOAT)

How many points numbers had a class of 250cc, a year prior to 1978, Yamaha as a team, and where wins was more than 0?
SELECT COUNT("Points") FROM table_74983 WHERE "Class" = '250cc' AND "Year" < '1978' AND "Team" = 'yamaha' AND "Wins" > '0'
SELECT COUNT("Points") FROM "table_74983" WHERE "Class" = '250cc' AND "Team" = 'yamaha' AND "Wins" > '0' AND "Year" < '1978'