Database Systems: Design, Implementation, & Management
11th Edition
ISBN: 9781285196145
Author: Steven, Steven Morris, Carlos Coronel, Carlos, Coronel, Carlos; Morris, Carlos Coronel and Steven Morris, Carlos Coronel; Steven Morris, Steven Morris; Carlos Coronel
Publisher: Cengage Learning
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Question
Chapter 4, Problem 7RQ
a)
Program Plan Intro
Graphical representation of ERM (Entity Relationship Model) entity component:
Crow’s Foot entity box for “Student”
b)
Program Plan Intro
Graphical representation of ERM cardinality component:
The following table illustrates the different connectivity and participation combinations which are maintained by the Crow’s Foot notation:
Crow’s Foot cardinality notation
| Notation | Cardinality | Description |
 |
(0,N) | Zero or more instances |
 |
(1,N) | One or more instances |
 |
(1,1) | One instance |
 |
(0,1) | Zero or one instance |
c)
Program Plan Intro
Graphical representation of ERM entity component:
Crow’s Foot weak relationship symbol
d)
Program Plan Intro
Graphical representation of ERM entity component:
Crow’s Foot strong relationship symbol
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Students have asked these similar questions
Analyze the given entity relationship diagram and answer the following questions.
What is the degree of “has” relationship?
What are the differences between weak and strong entity sets?
Given the ER diagram above, answer the following questions:
a. Name an entity type that has more than 2 relationships.
b. Name one ket attribute and the entity type it belongs to.
c. Name one one-to-one relationship and the entity types it relates.
d. Name one many-to-many relationship and its entity types.
e. Name one relationship attribute.
f. What is the cardinality of relationship ‘employs’?
g. What is the cardinality of relationship ‘textUsed’?
h. Name one weak entity type
i. Does it have a partial key? If yes, name it. ii. Name its identifying entity type
iii. Name its identifying relationship
Question 2 A bank provides services to customers. The banks is identified by its code and has a name and an address. The bank has several branches. A branch is identified by its code that is unique for a given bank. The branch name and address are also stored in the database.
Customers deal with the bank through the bank branches. So, a customer belongs to a specific bank branch. Customers…
Chapter 4 Solutions
Database Systems: Design, Implementation, & Management
Ch. 4 - Prob. 1RQCh. 4 - What is a strong (or identifying) relationship,...Ch. 4 - Prob. 4RQCh. 4 - Suppose you are working within the framework of...Ch. 4 - Prob. 6RQCh. 4 - Prob. 7RQCh. 4 - Discuss the difference between a composite key and...Ch. 4 - What two courses of action are available to a...Ch. 4 - Prob. 11RQCh. 4 - Discuss two ways in which the 1:M relationship...
Ch. 4 - Prob. 13RQCh. 4 - Prob. 14RQCh. 4 - Briefly, but precisely, explain the difference...Ch. 4 - What are multivalued attributes, and how can they...Ch. 4 - Prob. 17RQCh. 4 - Prob. 18RQCh. 4 - What two attributes must be contained in the...Ch. 4 - Describe precisely the composition of the...Ch. 4 - Prob. 21RQCh. 4 - Prob. 1PCh. 4 - Create a complete ERD in Crows Foot notation that...Ch. 4 - Prob. 4PCh. 4 - Prob. 5PCh. 4 - Prob. 6PCh. 4 - Prob. 7PCh. 4 - Prob. 8PCh. 4 - Prob. 9C
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- Suppose you are working within the framework of the conceptual model in Figure Q4.5. FIGURE Q4.5 THE CONCEPTUAL MODEL FOR QUESTION 5arrow_forwardData modelling is most often accomplished through the use of a(an) ________________. a. entity-relationship diagram b. data-flow diagram c. functional decomposition diagram d. activity diagramarrow_forwardFor each of the following pairs of related entities, indicate whether (under typical circumstances) there is a one-tomany or a many-to-many relationship. Then, using the shorthand notation introduced in the text, draw a diagram for each of the relationships.a. STUDENT and COURSE (students register for courses)b. BOOK and BOOK COPY (books have copies)c. COURSE and SECTION (courses have sections)d. SECTION and ROOM (sections are scheduled in rooms)e. INSTRUCTOR and COURSEarrow_forward
- For each entity, there needs to be an indication of whether it is one-to-one, one-to-many or many-to-many relationship. Here are the answers I have but I could use more guidance with it. I struggle with this type of question. BOOK and BOOK COPY (1:1) COURSE and COURSE-SECTION (M:N) COURSE-SECTION and ROOM (M:1) INSTRUCTOR and COURSE (1:M) ROOM and INSTRUCTOR (M:1)arrow_forwardWhat does an associative entity model? a.) Associative entities model pure relationships rather than entities. b.) Associative entities model entities that are independent. c.) Associative entities model the real-world scenarios of ways to look up data. d.) Associative entities model attributes and how they are linked to entities.arrow_forwardSpecifically, on which side of a many-to-one connection does the primary key of one entity function as a foreign key? There is a huge number of relationships specified on one side of the diagram. both from the inside and the outside It is possible to define two relationships at the same time. On the one hand, one connection is defined; on the other, another relationship is defined.arrow_forward
- How do you map a "Many to Many" relationship when mapping ER Diagram to Schema Select one: O a. Take the primary key of both entities and put them as foreign keys in a separate table O b. Take the primary key of entity in the second "Many" side and put it as a foreign key in the table representing entity in the first "Many" side O c. Take the primary key of entity in the first "Many" side and put it as a foreign key in the table representing entity in the second "Many" side O d. Take the primary key of entity in the "Many" side and put it as a foreign key in the table representing entity in the "full" sidearrow_forwardDraw an Entity Relationship Diagram for ther following information.arrow_forwardList the Entity-Relationship (ER) model's various characteristics.arrow_forward
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