CREATE TABLE roller_coaster (roller_coaster_id DECIMAL, name TEXT, park TEXT, country_id DECIMAL, length DECIMAL, height DECIMAL, speed TEXT, opened TEXT, status TEXT)
CREATE TABLE country (country_id DECIMAL, name TEXT, population DECIMAL, area DECIMAL, languages TEXT)

Show the name and population of the country that has the highest roller coaster.
SELECT T1.name, T1.population FROM country AS T1 JOIN roller_coaster AS T2 ON T1.country_id = T2.country_id ORDER BY T2.height DESC LIMIT 1
SELECT "T1"."name", "T1"."population" FROM "country" AS "T1" JOIN "roller_coaster" AS "T2" ON "T1"."country_id" = "T2"."country_id" ORDER BY "T2"."height" DESC NULLS LAST LIMIT 1