nvert the following ERD in Chen's notation to an ERD in IE notation. All entities, attributes, and relationships are artificial. You need to clearly show strong and weak entities, foreign key migrations, total participations and partial participations, and cardinality ratios. 02 a1 e2_a2 r1_a1 e1 a1 e1_a2 N 1 F? R1 F1

nvert the following ERD in Chen's notation to an ERD in IE notation. All entities, attributes, and relationships are artificial. You need to clearly show strong and weak entities, foreign key migrations, total participations and partial participations, and cardinality ratios. 02 a1 e2_a2 r1_a1 e1 a1 e1_a2 N 1 F? R1 F1

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Every flimsy entity set may be strengthened by the addition of pertinent characteristics. What therefore, is the cause of our subpar entity sets?
A public sector hospital wants to automate its manual paper based operations to speed up the operations and facilitate its patients and staff members. For this purpose, they want to develop a database for their hospital management system to remove paper based records. Now, you are required to analyze the following scenario very carefully and draw entity relationship diagram (ERD) for the given system by identifying entities, attributes and relationship among these entities. A hospital consists of various specialized wards where each ward has its unique ID, name and capacity (total number of beds for patients in each ward). Multiple patients can be admitted in each ward on the recommendations of the doctor. Each doctor has a unique id, name, specialization and etc. Furthermore, a specialized team of doctors in each ward will take care of admitted patients and suggest treatment for the patients (such as medication, recommended tests, date of admission, and date of discharge). Each ward…
In the context of EER data modeling, one can represent entities using superclasses and subclasses. Using your own model, explain why one would want to introduce the concepts of superclasses and subclasses into an EER model? I. II. Describe and illustrate using the model in question (I) the process of attribute inheritance. With the model in question (I) describe and contrast the process of specialization with the process of generalization. III. IV. Modify the model to describe the two main constraints that apply to a specialization/generalization relationship.
Develop an EER model for the following situation using the traditional EER notation, the Visio notation, or the subtypes inside supertypes notation, as specified by your instructor: An international school of technology has hired you to create a database management system to assist in scheduling classes. After several interviews with the president, you have come up with the following list of entities, attributes, and initial business rules: • Room is identified by Building ID and Room No and also has a Capacity. A room can be either a lab or a classroom. If it is a classroom, it has an additional attribute called Board Type. • Media is identified by MType ID and has attributes of Media Type and Type Description. Note: Here we are tracking type of media (such as a VCR, projector, etc.), not the individual piece of equipment. Tracking of equipment is outside the scope of this project. • Computer is identified by CType ID and has attributes Computer Type, Type Description,…
Every SuperKey is a key but not vice versa True False In Relational database modeling, any complex attribute (multi-valued composite or composite with multi-valued component) Can be Directly represented as is without limitations or changes to be done True False Predicate-defined subclasses refers to the classification process of entities in to subclasses based on a conditional value for an attribute, and is shown in an ERD/EERD on the arc connecting the subclass to the specialization bubble True False
The model above needs some improvement. Where you can apply all the normalization rules to attributes. Furthermore, you also need to explain entities and relations between them, and the purpose of attributes by showing why and how they exist ?.
Create an E-R model for the following scenario. Show entity names, primary keys, attributes for each entity, relationships between the entities and cardinality. Lonestar Car Dealer is a leading car dealership in US. The dealership sells both new and used cars, and it has a service facility as well. There are a couple of requirements that the database must meet. Those are as follows. Each car is sold by a salesperson. One car sale has only one salesperson. But one salesperson may sell many cars. Customers buy one or many cars. But single sale can have only one customer (No multiple customers for a given car sale). The salesperson writes one invoice for each car he/she sells. Customer is issued this invoice. A customer may be just a service center customer and does not need to be a car buyer. One service ticket per each car is issued when it is reached to the service center. The car a service history is maintained for each of the cars serviced. Car has a unique serial number. One or more…
What's the difference between weak and strong entity sets?
When mapping generalisations and specialisations in enhanced entity relationship diagrams, which solution will deliver the least redundancy and allow representation of the most specialisation types. Select one: a. Multiple relations representing subclass entities only. b. A single relation containing a type attribute. c. Multiple relations representing both superclass and subclass entities. d. A single relation with multiple boolean type attributes.
What are the differences between weak and strong entity sets?
Question 3Discuss in detailed explanation that the concept that an attribute that is part of a composite primary key is also a candidatekey.
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? (a) We want to avoid the data duplication and consequent possible inconsis- tencies caused by duplicating the keyof the strong entity set.(b) Weak entities reflect the logical structure of an entity being dependent on another entity.(c) Weak entities can be deleted automatically when their strong entity is deleted.(d) All of the above.