Question: 1-In what circumstances the composite primary key is appropriate? 2-Design the EERD for a media store that have a PRODUCT supertype containing attributes, Prod_Title, Prod_ReleaseDate,

  • 1-In what circumstances the composite primary key is appropriate?
  • 2-Design the EERD for a media store that have a PRODUCT supertype containing attributes, Prod_Title, Prod_ReleaseDate, Prod_Price, Prod_Type. The subtypes can be BOOK, CD or MOVIE. The book subtype has specific attributes such as Book_CoverType, Book_PageCount, CD has specific attributes as CD_Genre, CD_Artist and Movie has specific attributes like Movie_Rating and Movie_Director.
  • 3-Create a database for the scenario given in Question 2. Make sure that disjoint/overlapping constraints and partial/overlapping constraints are taken care of.

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