How many stadiums does each country have?
SELECT country ,  count(*) FROM stadium GROUP BY country
SELECT country ,  count(*) FROM stadium GROUP BY country
[{'Country': 'Azerbaijan', 'count(*)': 1}, {'Country': 'England', 'count(*)': 1}, {'Country': 'France', 'count(*)': 1}, {'Country': 'Hungary', 'count(*)': 1}, {'Country': 'Russia', 'count(*)': 4}, {'Country': 'Spain', 'count(*)': 2}]