Show names of actors that have appeared in musical with name "The Phantom of the Opera".
create table actor (name varchar, musical_id varchar, PRIMARY KEY (name)); create table musical (musical_id varchar, name varchar, PRIMARY KEY (musical_id))
select t1.name from actor as t1 join musical as t2 on t1.musical_id = t2.musical_id where t2.name = "the phantom of the opera"