CREATE TABLE table_6494 ("Tie no" CLOB, "Home team" CLOB, "Score" CLOB, "Away team" CLOB, "Attendance" CLOB)

Which Tie # has an Away team of slough town?
SELECT "Tie no" FROM table_6494 WHERE "Away team" = 'slough town'
SELECT "Tie no" FROM "table_6494" WHERE "Away team" = 'slough town'