CREATE TABLE round (round_id DECIMAL, member_id DECIMAL, decoration_theme TEXT, rank_in_round DECIMAL)
CREATE TABLE member (member_id DECIMAL, name TEXT, country TEXT, college_id DECIMAL)
CREATE TABLE college (college_id DECIMAL, name TEXT, leader_name TEXT, college_location TEXT)

Show the most common country across members.
SELECT country FROM member GROUP BY country ORDER BY COUNT(*) DESC LIMIT 1
SELECT "country" FROM "member" GROUP BY "country" ORDER BY COUNT(*) DESC NULLS LAST LIMIT 1