CREATE TABLE table_63323 ("Tie no" TEXT, "Home team" TEXT, "Score" TEXT, "Away team" TEXT, "Date" TEXT)

What's the tie number when the away team was Mansfield Town?
SELECT "Tie no" FROM table_63323 WHERE "Away team" = 'mansfield town'
SELECT "Tie no" FROM "table_63323" WHERE "Away team" = 'mansfield town'