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. Describe and illustrate using the model in question (I) the process of attribute inheritance. П. With the model in question (I) describe and contrast the process of specialization with the process of generalization. III.

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. Describe and illustrate using the model in question (I) the process of attribute inheritance. П. With the model in question (I) describe and contrast the process of specialization with the process of generalization. III.

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

See similar textbooks

Similar questions

PART 1The goal of this assignment is to design a conceptual schema using the (E)ER Data model.(E)ER data modelDesign a schema that incorporates the specification described below as efficiently as possible.You should submit a written diagram of your schema design using the notation given in theclass. In this diagram, indicate all the classes, subclasses, relationships (weak & strong),relationship cardinalities and degrees, total participations, attributes, and primary keys. Inaddition, specify whether each attribute is single-valued or multi-valued, stored or derived, andatomic or composite. In your design, you can make and state reasonable assumptions if they arenot specified in the specification.Design SpecificationYelp is a local business directory service and review site with social networking features. Itallows users to give ratings and review businesses. You are going to design the database systemfor Yelp (www.yelp.com). It should store and manage the following information but…
our task for this assignment is to complete a database design for the given case studies. Model the system described in the case study and draw a Physical Data Model using MySQL Workbench. Your diagram must conform to the notation used in this subject (object notation = ‘Workbench Simplified’, relationships notation = ‘Crows Foot’, show data types). If you include sub-types, place them inside a Layer with a note explaining their relationship to the super-type.
The objective is to create a system that allows you to completely manage the functions of thecompany through an optimal design of the data model, to be adapted to a system connected to aSQL database. StatementThe pharmacy chain “Recetas Rayos X” needs a system to manage information about its operations, such as the purchase, sale and administration of medications, other patients and who prescribed them.a medicine. The information that must be stored is the following:1. Patients are identified by the RUT and the name, surname, date of birth, email,address, several telephone numbers and pension system.2. There are various health provisions, both social and private, and they are correctly codified.3. Doctors are identified by the RUT. For each doctor you have to store the first name, last name,date of birth, specialties and years of practice.4. There are various specialties which are adequately codified.5. Each pharmaceutical company is identified by a code, the name and a telephone…
The objective is to create a system that allows you to completely manage the functions of thecompany through an optimal design of the data model, to be adapted to a system connected to aSQL database. StatementThe pharmacy chain “Recetas Rayos X” needs a system to manage information about its operations, such as the purchase, sale and administration of medications, other patients and who prescribed them.a medicine. The information that must be stored is the following:1. Patients are identified by the RUT and the name, surname, date of birth, email,address, several telephone numbers and pension system.2. There are various health provisions, both social and private, and they are correctly codified.3. Doctors are identified by the RUT. For each doctor you have to store the first name, last name,date of birth, specialties and years of practice.4. There are various specialties which are adequately codified.5. Each pharmaceutical company is identified by a code, the name and a telephone…
Q. 1 Consider a university database for the scheduling of classrooms for final exams. This database could be modeled as the single entity set exam, with attributes course-name, section-number, room-number, and time. Alternatively, one or more additional entity sets could be defined, along with relationship sets to replace some of the attributes of the exam entity set, as1. course with attributes name, department, and c-number2. section with attributes s-number and enrollment, and dependent as a weak entity set on course3. room with attributes r-number, capacity, and buildingShow an E-R diagram illustrating the use of all three additional entity sets Listed and also specify the primary keys all
This test concerns database design, including both the logical design via the Entity Relationship (E - R) model and the physical model via relational database tables. The subject of the model is the registration of students in college classes, and there may be multiple classes for each course. The college model should include: courses (for example the CBU catalog), the current classes (or course-sections) given for courses (for example the CBU schedule for a term), the faculty qualified to teach courses, the scheduling of classes (to buildings/rooms, times, and faculty members), the assignment of faculty to students for advising (1 advisor per student), and the scheduling of students to classes.For unique identifiers you can use the following abbreviations:SID Student IDCID Course ID (ie MIS 471, …)SEC Course Section (ie A, B, C, …)BID Building ID (ie BU, BH, K, …)RID Room NumberFID Faculty IDTID Timeslot ID (ie TR 9:30, MWF 8am, …)CRN Course Record Number (an auto key for each…
Draw the relationships and entities model for each of the following: * in the traditional way* for example: see the pic??. In the database of the library, the author can author more than one book, and the book can be subscribed toWritten by more than one author
Consider a database schema with a relation Emp whose attributes are as shown below, with types specified for multivalued attributes. Emp = (ename, ChildrenSet multiset(Children), SkillSet multiset(Skills))Children = (name, birthday)Skills = (type, ExamSet setof(Exams))Exams = (year, city) Redesign the database above into first normal form and fourth normal form. List any functional and multivalued dependencies that you assume. Also list all referential-integrity constraints that should be present in the first and fourth normal form schemas.
I need to choose which model matches this question. In the context of data models, which of the following models emphasize a global view of data that is independent of the database model type? a. internal model b. physical model c. external model d. conceptual model
Consider a database that includes the entity sets student, course, and sectionfrom the university schema and that additionally records the marks that studentsreceive in different exams of different sections.a. Construct an E-R diagram that models exams as entities and uses a ternaryrelationship as part of the design.b. Construct an alternative E-R diagram that uses only a binary relationshipbetween student and section. Make sure that only one relationship existsbetween a particular student and section pair, yet you can represent themarks that a student gets in different exams.
Suppose we have a relational database with five tables.table key AttributesS(sid, A) SidT(tid, B) TidU(uid, C) UidR(sid, tid, D) sid, tidQ(tid, uid, E) tid, uidHere R implements a many-to-many relationship between the entities implemented with tables S and T, and Q implements a many-to-many relationship between the entities implemented with tables T and U.D. Suppose you replaced SELECT with SELECT DISTINCT in your queries from parts (a) and Could one of these modified queries return more records than the other? If so, which one? Justify your answer. E. Consider again your query from part (a). If pair sid, uid is returned by this query then there must exist at least one “path” that goes from from table S to table T (via relation R) and then from table T to table U (via relation Q). Note that there can be many such paths for a given pair sid, uid. Write an SQL query that returns records of the form tid, total where…
What is the function of a ModelGen operator? A It identifies fundamental conflicts and devises rules for resolving them. B It takes a model in one meta-model and translates it into another meta-model. (C) It transforms the data from one data model to another and applies a schema mapping. D It transforms data from the model and schema in which it is stored into the target message format.