CREATE TABLE actor (Name VARCHAR2, Musical_ID VARCHAR2)
CREATE TABLE musical (Musical_ID VARCHAR2, Name VARCHAR2)

Show names of actors that have appeared in musical with name 'The Phantom of the Opera'.
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"
SELECT "T1"."Name" FROM "actor" "T1" JOIN "musical" "T2" ON "T1"."Musical_ID" = "T2"."Musical_ID" AND "T2"."Name" = "The Phantom of the Opera"