Show the names of roller coasters of Australia and Finland in separate table
SELECT T2.Name FROM country AS T1 JOIN roller_coaster AS T2 ON T1.Country_ID   =   T2.Country_ID where T1.Name  =  'Austria' or T1.Name  =  'Finland'
names of roller coasters in Australia and Finland requires JOIN between country and roller_coaster tables on Country_ID; separate table means a single query result with all names from both countries;