CREATE TABLE table_31480 ("Result" TEXT, "Date" TEXT, "Race" TEXT, "Venue" TEXT, "Group" TEXT, "Distance" TEXT, "Weight  ( kg ) " TEXT, "Jockey" TEXT, "Winner/2nd" TEXT)

List the rider for the doncaster handicap compeition.
SELECT "Jockey" FROM table_31480 WHERE "Race" = 'Doncaster Handicap'
SELECT "Jockey" FROM "table_31480" WHERE "Race" = 'Doncaster Handicap'