clearly any additional assumptions you make. If we add the relationship ADOPTS, to indicate the textbook(s) that an instructor uses for a course, should it be a binary relationship between INSTRUCTOR and TEXT, or a ternary relationship among all three entity types? What (min, max) con- straints would you put on the relationship? Why?

clearly any additional assumptions you make. If we add the relationship ADOPTS, to indicate the textbook(s) that an instructor uses for a course, should it be a binary relationship between INSTRUCTOR and TEXT, or a ternary relationship among all three entity types? What (min, max) con- straints would you put on the relationship? Why?

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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Concept explainers

Enhanced ER Model

The enhanced ER model is an abbreviation for Enhanced Entity-Relationship (EER) model. As you know, the entity-relationship (ER) model is a pictorial illustration of the relationship between various entities of a domain. In the case of a large amount of data with multiple interrelated entities, the ER diagrams become complex and tough to interpret. For such cases, the need for enhancement in the ER model was observed, and thus, the EER model was designed.

Question

=.25. Consider the ER diagram in
not use a textbook, but that a text by definition is a book that is used in some
course. A course may not use more than five books. Instructors teach from
two to four courses. Supply (min, max) constraints on this diagram. State
clearly any additional assumptions you make. If we add the relationship
ADOPTS, to indicate the textbook(s) that an instructor uses for a course,
should it be a binary relationship between INSTRUCTOR and TEXT, or a
ternary relationship among all three entity types? What (min, max) con-
straints would you put on the relationship? Why?
Assume that a course may or may
INSTRUCTOR
TEACHES
COURSE
USES
TEXT

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what can be very interesting about the Entity-Relationship (ER) Modeling that people may forget about ( i am not talking about the main function or explication but just a concept/part that people tend to overlook when they study it for the first time?
Prepare an E-R diagram for a real estate firm that lists property for sale. Identify all entities (supertype/subtype), attributes (optional/required), unique identifiers, relationships and relationships cardinality and optionality. Resolve any M-M relationship you find. • The firm has several sales offices in several states. Each sales office has Office_Number and a Location. • Employees are assigned to work in different sales offices. Each employee has an ID and Name. • An employee must be assigned to only one sales office. For each sales office, there is always one employee assigned to manage that office. For each manager we record the start date of the management job. • The firm lists properties for sale. Each property has an ID, description and Location. Each unit of property must be listed with one (and only one) of the sales offices. A sales office may have any number of properties listed. • Each unit of property has one or more owners. owners have ID and Name. An owner may own…
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No hand written and fast answer with explanation
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Suppose that we wish to keep a genealogy. The information we wish to record about each person includes their name, date of birth, phone number, and degrees obtained . We also need to keep track of the mother, father, and children of each person. Draw a complete Entity-Relationship diagram. You must include all the details, sad as keys, weak entities (if any), cardinality constraints, etc. Your diagram must avoid redundancy.
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13. What are the different types of relationship that can be established while constructing use case diagram? What is the conceptual difference between "include" and "extend" relationship in use case diagram? Explain.
Clear solution with steps, please.