CREATE TABLE table_51251 ("Home team" TEXT, "Home team score" TEXT, "Away team" TEXT, "Away team score" TEXT, "Venue" TEXT, "Crowd" FLOAT, "Date" TEXT)

What is the Away team score for Away team Melbourne?
SELECT "Away team score" FROM table_51251 WHERE "Away team" = 'melbourne'
SELECT "Away team score" FROM "table_51251" WHERE "Away team" = 'melbourne'