CREATE TABLE table_6419 ("Position" FLOAT, "Team" TEXT, "Points" FLOAT, "Played" FLOAT, "Drawn" FLOAT, "Lost" FLOAT, "Against" FLOAT, "Difference" TEXT)

How many Against have Played smaller than 18?
SELECT COUNT("Against") FROM table_6419 WHERE "Played" < '18'
SELECT COUNT("Against") FROM "table_6419" WHERE "Played" < '18'