Homework1 - EECS 484 Homework #1 Question 1: Consider the...

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Unformatted text preview: EECS 484 Homework #1 Question 1: Consider the following ER Diagram, which associates actors and movies. Which of the following statements is true? (Select all that apply.) a) An actor can star in multiple movies. b) Each actor has to star in a movie. c) Every movie has a star. d) A movie can have no more than one star. Explain your answer: -- An actor can star in multiple movies (TRUE) -- There is no key constraint between the Actor entity set and the Stars relationship set. Therefore, an actor can star in multiple movies. -- Every actor has to star in a movie (FALSE) -- There is no participation constraint between the Actor entity set and the Stare relationships set. Therefore, an actor need not star in a movie. -- Every movie has a star (FALSE) -- There is no participation constraint between Movie and Stars. Therefore, there can be movies without a star. -- Every movie has no more than one star (TRUE) -- There is a key constraint between Movie and Stars, which mean any particular movie can only have one star. Question 2: Define the terms physical data independence and logical data independence in the context of relational databases....
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This note was uploaded on 12/08/2011 for the course EECS 484 taught by Professor Staff during the Winter '08 term at University of Michigan.

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Homework1 - EECS 484 Homework #1 Question 1: Consider the...

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