CREATE TABLE table_18845 ("Result" TEXT, "Date" TEXT, "Race" TEXT, "Venue" TEXT, "Group" TEXT, "Distance" TEXT, "Weight  ( kg ) " FLOAT, "Jockey" TEXT, "Winner/2nd" TEXT)

How many races were for a distance of 2020 m?
SELECT COUNT("Group") FROM table_18845 WHERE "Distance" = '2020 m'
SELECT COUNT("Group") FROM "table_18845" WHERE "Distance" = '2020 m'