What is the largest number of gold medals for Canada with more than 7 bronze medals?
CREATE TABLE "all_time_medal_tables" (
  "rank" text,
  "nation" text,
  "gold" real,
  "silver" real,
  "bronze" real,
  "total" real
);
SELECT MAX("gold") FROM "all_time_medal_tables" WHERE "nation"='canada' AND "bronze">7;