Question: What is the name of the away team with a Tie no of 7?
SQL: SELECT "Away team" FROM "2-17559580-6" WHERE "Tie no" = '7';

Question: What is home team Chelsea's Tie no?
SQL: SELECT "Tie no" FROM "2-17559580-6" WHERE "Home team" = 'Chelsea';

Question: What away team has a Tie no of 5?
SQL: SELECT "Away team" FROM "2-17559580-6" WHERE "Tie no" = '5';