CREATE TABLE roller_coaster (Country_ID VARCHAR, Height VARCHAR)
CREATE TABLE country (Name VARCHAR, population VARCHAR, Country_ID VARCHAR)

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