Database: superhero (difficulty: simple)
Question: List the superheroes from J. R. R. Tolkien who have the super power of 'Super Strength'.
SQL: SELECT superhero_name FROM superhero AS T1 WHERE EXISTS (SELECT 1 FROM hero_power AS T2 INNER JOIN superpower AS T3 ON T2.power_id = T3.id WHERE T3.power_name = 'Super Strength' AND T1.id = T2.hero_id)AND EXISTS (SELECT 1 FROM publisher AS T4 WHERE T4.publisher_name = 'J. R. R. Tolkien' AND T1.publisher_id = T4.id)