Consider a database schema with three relations:

Movies (movie_id:integer, title:string, year:integer, studio:string)

Actors (actor_id:integer, name:string, nationality:string)

StarsIn(actor_id:integer, movie_id:integer, character:string)

The keys are underlined in each relation. Relation Movies stores information such as unique movie identifier, title, year and producing studio. Actors contains unique actor identifier, actor name and nationality. Relation StarsIn tracks which actor starred in which movie, and the name of the character interpreted in that movie. Assume that one actor plays at most one character in the same movie.

Write relational algebra expressions for the following queries:

Find the names of actors that star in exactly one movie.

(Can someone help me to solve this problem?)