Attracted by the success of Spotify, a group of students want to build their own music-streaming website called Musicmatic. Being economists, they are unaware of the specificities of databases and have therefore asked you to create an EER model.
Attracted by the success of Spotify, a group of students want to build their own music-streaming website called Musicmatic. Being economists, they are unaware of the specificities of databases and have therefore asked you to create an EER model.
A large number of songs will be made available through their website, and the following information on each song needs to be stored: title, year, length, and genre. Also, artist information will be added, including date of birth, name, and a URL to a website (e.g., Wikipedia page) with additional information on the artist. You can assume an artist is uniquely identified by her name, and that a song always belongs to exactly one artist. The Musicmatic students also point out that songs having the same title are possible, and only the combination of song and artist can be assumed to be unique.
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The students want to offer a flexible service, and decided business users only can upload individual songs. These songs are classified either as singles or videos, and regular users can directly buy the singles (but they cannot purchase videos).
Finally, a user can be a regular user on some occasions (e.g., when downloading a single or album), and a business user at other times (e.g., when uploading self-made songs to Musicmatic).
Capture as much of the semantics of this situation as you can in an EER diagram!
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