Table: gfc_index
Columns: rank
centre
country
rating
change

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 gfc_index WHERE "change" < 44 AND "centre" = 'buenos aires' AND "rating" > 628

Question: Which Centre has a Rank of 42?
SQL: SELECT "centre" FROM gfc_index WHERE "rank" = 42

Question: Which Rating has a Centre of helsinki?
SQL: SELECT SUM("rating") FROM gfc_index 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 gfc_index WHERE "centre" = 'buenos aires' AND "rank" < 46