CREATE TABLE table_54606 ("Player" TEXT, "Tackles" FLOAT, "Asst." FLOAT, "TotalTK" FLOAT, "Sack" FLOAT, "Yards" FLOAT, "FumR" FLOAT)

what is the total sack for mike green when fumr is less than 0?
SELECT SUM("Sack") FROM table_54606 WHERE "Player" = 'mike green' AND "FumR" < '0'
SELECT SUM("Sack") FROM "table_54606" WHERE "FumR" < '0' AND "Player" = 'mike green'