Database Systems: Design, Implementation, & Management
12th Edition
ISBN: 9781305627482
Author: Carlos Coronel, Steven Morris
Publisher: Cengage Learning
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Chapter 4, Problem 11RQ
Program Plan Intro
Entity:
In ER model, the term “entity” refers to the actual entity set. It is represented by a rectangle box which contains the entity name.
- There is no any difference among various types of entities such as a weak entity and a composite entity. But Crows Foot use different relation types as strong or weak.
- A composite entity is stated that one or more PK attributes is also a Foreign Key (FK).
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How is a relationship between entities indicated in an ERD? Give an example using the Crow’s Foot notation.
Why are weak and strong entity sets different?
Can you please help me in how I can turn the Entity Relationship diagram into a Logical Database Diagram?
I know I need to list out all the entities, but I am not sure how to draw the relation. If you would please write it step by step for me so I can practice, that would be much appreciated.
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. 9PCh. 4 - Prob. 10PCh. 4 - Prob. 11C
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- The ______________ model is a simple but highly useful way to organize data into collections of two-dimensional tables called relations.arrow_forwardData modeling is most often accomplished through the use of a(n) __________________. a. entity-relationship diagram b. data-flow diagram c. functional decomposition diagram d. activity diagramarrow_forwardUsing a graphics program, develop an entity-relationship diagram for a database application for an Internet bookstore where students buy textbooks from a salesperson and receive invoices for their purchases. Use Figure 5.5 as a guide.arrow_forward
- For 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_forwardBuild an entity-relationship diagram, deriving relations and validating relations using normalization up to third normal formarrow_forwardWhen working with database entity relationship modeling, should the cardinality between entities be translated/ read from both ends of the notation? In other words, should a relationship between entities have the ability to understood if read forwards and backwards?arrow_forward
- What is used to indicate a weak relationship in an ERD in Crow’s Foot notation? Dashed line between entities Double rectangular box Solid line between entities Single rectangular boxarrow_forwardQUESTION 4 For the following collection of entities, give the assumptions concerning the relationship between entities. ORDER (order#, ordDate, cust#, cName ) ORDER_PART ( order#, part#, quantity ) PART ( part#, description, price )arrow_forwardModify the Er diagram given below and add 5 to 6 more additions to it such as entities attributes relationships etcarrow_forward
- Just what does "weak entity type" mean? Is there a secret to it? Can you explain the meaning of "attribute"?How does sia look like on an ER chart? Please illustrate with a diagram.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_forwardBased on Entity Relationship Diagram (ERD) below; a) Write the correct business rules for all entities. b) Write the suitable relationship name for (a) and (b). RESERVATION GUEST ROOM PK RSV_ID PK GUEST_ID RSV_DATE PK ROOM_ID GUEST_NAME ARRIVAL_DATE (b) ROOM_TYPE GUEST_PHONENO (a) DEPART_DATE ROOM_RATE GUEST_ADDRESS NO_OF_GUESTS FK1 RSV_ID NO_OF_ROOMS FK1 GUEST_IDarrow_forward
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