CREATE TABLE table_49381 ("Result" TEXT, "Race" TEXT, "Distance" TEXT, "Weight" FLOAT, "Winner or 2nd" TEXT, "Pos'n" TEXT)

What is the sum of the weight of the race with a 1st pos'n and a 8f distance?
SELECT SUM("Weight") FROM table_49381 WHERE "Pos'n" = '1st' AND "Distance" = '8f'
SELECT SUM("Weight") FROM "table_49381" WHERE "Distance" = '8f' AND "Pos'n" = '1st'