Question: What is Celta's Agg.?
SQL: SELECT "Agg." FROM "2-17074170-4" WHERE "Team 1" = 'Celta';

Question: What is the 2nd leg for Barcelona Team 2?
SQL: SELECT "2nd leg" FROM "2-17074170-4" WHERE "Team 2" = 'Barcelona';

Question: What is team 2 if Team 1 is Numancia?
SQL: SELECT "Team 2" FROM "2-17074170-4" WHERE "Team 1" = 'Numancia';