CREATE TABLE table_12727 ("Tie no" TEXT, "Home team" TEXT, "Score" TEXT, "Away team" TEXT, "Date" TEXT)

What is the Tie no of the Carlisle United Away game on 17/11/1990 with a Score of 5 0?
SELECT "Tie no" FROM table_12727 WHERE "Date" = '17/11/1990' AND "Score" = '5–0' AND "Away team" = 'carlisle united'
SELECT "Tie no" FROM "table_12727" WHERE "Away team" = 'carlisle united' AND "Date" = '17/11/1990' AND "Score" = '5–0'