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

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" "T1" JOIN "roller_coaster" "T2" ON "T1"."country_id" = "T2"."country_id" ORDER BY "T2"."height" DESC FETCH FIRST 1 ROWS ONLY