Question: Which Rank is the highest one that has a Change smaller than 44, and a Centre of buenos aires, and a Rating larger than 628?
SQL: SELECT MAX("Rank") FROM "2-15231621-2" WHERE "Change" < 44.0 AND "Centre" = 'buenos aires' AND "Rating" > 628.0;

Question: Which Centre has a Rank of 42?
SQL: SELECT "Centre" FROM "2-15231621-2" WHERE "Rank" = 42.0;

Question: Which Rating has a Centre of Helsinki?
SQL: SELECT SUM("Rating") FROM "2-15231621-2" WHERE "Centre" = 'Helsinki';

Question: Which Change is the average one that has a Centre of buenos aires, and a Rank smaller than 46?
SQL: SELECT AVG("Change") FROM "2-15231621-2" WHERE "Centre" = 'buenos aires' AND "Rank" < 46.0;