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DBMS Korth Edition 6 Exercise 7 Question 19 (Page No. 319)
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We can convert any weak entity set to a strong entity set by simply adding
appropriate attributes. Why, then, do we have weak entity sets?
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DBMS Korth Edition 6 Exercise 7 Question 20 (Page No. 319-320)
Consider the E-R diagram in Figure given below, which models an online bookstore. a. List the entity sets and their primary keys. b. Suppose the bookstore adds Blu-ray discs and downloadable videos to its collection. ... model the case where a shopping basket may contain any combination of books, Blu-ray discs, or downloadable video.
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DBMS Korth Edition 6 Exercise 7 Question 18 (Page No. 319)
Explain the difference between a weak and a strong entity set.
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DBMS Korth Edition 6 Exercise 7 Question 22 (Page No. 319-320)
Design a database for a worldwide package delivery company (e.g., DHL or FedEx). The database must be able to keep track of customers (who ship items) and customers (who receive items); some customers may do both. ... E-R diagram, a set of relational schemas, and a list of constraints, including primary-key and foreign-key constraints.
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DBMS Korth Edition 6 Exercise 7 Question 21 (Page No. 319)
Design a database for an automobile company to provide to its dealers to assist them in maintaining customer records and dealer inventory and to assist sales staff in ordering cars. Each vehicle is identified by a vehicle ... , a set of relational schemas, and a list of constraints, including primary-key and foreign-key constraints.
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