CREATE TABLE country (Name VARCHAR2, Country_ID VARCHAR2)
CREATE TABLE roller_coaster (Country_ID VARCHAR2)

Show the names of countries that have more than one roller coaster.
SELECT T1.Name FROM country AS T1 JOIN roller_coaster AS T2 ON T1.Country_ID = T2.Country_ID GROUP BY T1.Name HAVING COUNT(*) > 1
SELECT "T1"."Name" FROM "country" "T1" JOIN "roller_coaster" "T2" ON "T1"."Country_ID" = "T2"."Country_ID" GROUP BY "T1"."Name" HAVING COUNT(*) > 1