Consider an association between a Customers class and a Sale class in a Unified Modeling Language (UML) Class diagram. The multiplicities next to the Customers class are 1..1 and the multiplicities next to the Sale class are 0..*. Which of the following is the best way to implement that association in your database? Multiple Choice Post the primary key of Customers as a foreign key in Sales. Post the primary key of Sales as a foreign key in Customers. Create a linking table. None of these choices are correct.
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Assuming that customers place one or more orders will also be a valid solution. ORDER Order_ID CUSTOMER Customer_ID Order_Type is the attribute of the subtype discriminator. Having it here is not a must, but it helps in the relational model. Order_Date First_Name Payment_Method Last_Name [Total_Price] Places Address (City, State, Zip_Code) Phone_Number Order_Type Birthdate Registration_Date SHIPPED_ORDER SUBSCRIPTION Shipping_Method Subscription_Type Replacing the attributes on the relationship with associative entities is also a valid solution. Quantity_Ordered Contains ALBUM Album_ID Album_Title Album_Price Release_Date Played by Play_Count Play_Date SONG Song_ID Song_Title ARTIST Contains Written by Artist_ID Artist_Name Play_Time Debut_Date Belongs_to GENRE Genre_ID Genre_Name Assuming that Album_Title is the Primary key is also OK. Assignment 2 Statement: Convert the Above ERD into a relational model. You need to provide the relations in the notation discussed in class. ALL Primary Keys and Foreign Keys MUST be identified.
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When using an REA diagram to develop a database, a many-to-many relationship must be broken into two, one-to-one relationships. The type of relationship between two entities is determined by minimum and maximum cardinalities. Which of the following is not one of the three steps to implementing an REA diagram in a relational database? Why might the same REA diagram result in different relationship cardinalities? The primary key for M:N relationship tables always consists of two attributes and is the primary key of the most important entity linked to that relationship. Many-to-many relationship tables only use foreign keys.
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