PRI key

[John Chang]

In MYSQL I'm using MYISAM. Should the 2 fields in each of the Stars & TitleGenres
table be Primary keys since they are 'tied' to other fields?

Studios (StudioName, StudioID)
Genres (GenreName, GenreID)
Titles (VideoTitle, Details, StudioID, GenreID, BitRateID, TitleID)
Actors (F_Name, L_Name, ActorID)
Stars (TitleID, ActorID)
TitleGenres (TitleID, GenreID)

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