CREATE TABLE table_9402 ("Tie no" TEXT, "Home team" TEXT, "Score" TEXT, "Away team" TEXT, "Date" TEXT)

What is the number of ties when Altrincham is the home team?
SELECT "Tie no" FROM table_9402 WHERE "Home team" = 'altrincham'
SELECT "Tie no" FROM "table_9402" WHERE "Home team" = 'altrincham'