Question: A video store database has the following three relations. The underlined attributes are primary keys. Customer (CustomerID, Name) Film (FilmID, Title, RentalPrice) Reserved (CustomerID, FilmID,

A video store database has the following three relations. The underlined attributes are primary keys. Customer (CustomerID, Name) Film (FilmID, Title, RentalPrice) Reserved (CustomerID, FilmID, Date) Express the following query in the relational algebra: List the titles of films, if any, that has been reserved.

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