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The following Entity-Relationship diagram has two entity types and one relationship type. There are also three attributes and two participation constraints. takes Module grade code Student name 7..7 1..1 The diagram is intended to model a world in which students take modules and every student gets a grade for each of the modules they take. Every student must take exactly seven modules. The person who made the diagram said "The participation constraints include 7..7 to say how many modules a student may take, and the 1..1 is to ensure that every student gets one grade for each module."

The following Entity-Relationship diagram has two entity types and one relationship type. There are also three attributes and two participation constraints. takes Module grade code Student name 7..7 1..1 The diagram is intended to model a world in which students take modules and every student gets a grade for each of the modules they take. Every student must take exactly seven modules. The person who made the diagram said "The participation constraints include 7..7 to say how many modules a student may take, and the 1..1 is to ensure that every student gets one grade for each module."

Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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(a) Explain carefully four ways in which the diagram fails to model the intended world. In each case make sure you contrast the actual meaning with the intended meaning.

(b) Give an entity-relationship diagram, still using two entity types, which correctly models the intended world.

(c) Give a database schema (including primary keys) for the ER diagram which you have given in the previous part.

(d) Is there any part of the ER diagram which is not captured in the schema? How might this aspect be captured in the final database? 

The following Entity-Relationship diagram has two entity types and one relationship type. There are also three attributes and two participation constraints. takes Module grade code Student name 7..7 1..1 The diagram is intended to model a world in which students take modules and every student gets a grade for each of the modules they take. Every student must take exactly seven modules. The person who made the diagram said "The participation constraints include 7..7 to say how many modules a student may take, and the 1..1 is to ensure that every student gets one grade for each module."
Transcribed Image Text:The following Entity-Relationship diagram has two entity types and one relationship type. There are also three attributes and two participation constraints. takes Module grade code Student name 7..7 1..1 The diagram is intended to model a world in which students take modules and every student gets a grade for each of the modules they take. Every student must take exactly seven modules. The person who made the diagram said "The participation constraints include 7..7 to say how many modules a student may take, and the 1..1 is to ensure that every student gets one grade for each module."
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