In a class UML diagram, general relationships should be labelledwithO cardinalityO a relationship namedirection of the relationall of the above

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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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1. Create an entity named Employee and Dependent and create a one-to-many mapping using JPA. EMPLOYEE has DEPENDENT (0,N (1,1) EMP NUM EMP LNAME EMP FNAME EMP_INITIAL EMP DOB EMP_HIREDATE EMP NUM DEP NUM DEP FNAME DEP DOB Write a main program to assign values to the Employee and Dependent entity using entity manager instance.
Suppose you are going to design an instant messaging application called Telegraph. Telegraph is a modularized application composed of UI module, Chat module, and Contact module. The UI module uses the Chat module and the Contact module to render the user interface. The Chat module deals with sending and receiving messages. The Chat module uses the Network module for network communication. When users send/receive messages via the network, the Chat module uses the Crypto module to encrypt/decrypt the message. The Contact module manages the contact list. It also uses the Crypto module for encryption/decryption. The Crypto module uses the Math module for calculation. Now we propose a metric to measure the stability of modules. Formally, we define the "stability" of a module i as Si = a+dut where di" (i.e., incoming connection or dependency) is the number of modules that directly or indirectly USES module i and d?ut (i.e., outgoing connection or dependency) is the number of modules that…
What does it mean to be related? How do you define a relation's properties?
LOGICAL DATABASE DESIGN The above EER-Diagram represents a University Library Membership (see Diagram 5). A member can borrow as many books from the library. Derive relations for logical model from the above EER-Diagram. Please identify any primary key or foreign key in the derive relations (if applicable).
Let R₁ and R₂ be the relations on X={a,b,c}, R₁={ (b,a), (c,b), (a,c) } R₂={ (a,c), (b,c)} R₁-¹= R₂ ° R₁=
QUESTION 3 A functor is a function symbol that names the relationship, but the name can be anything as long as it's a valid identifier. True False
Primary key identifies a unique tuple of a relation, true or false?
Explain how functional dependencies may be used to indicate: • The entity sets student and teacher have a one-to-one relationship set.• Between entity setsstudent and teacher, there is a many-to-one connection set.
Relationships in a use case diagram are a powerful mechanism to organize and reuse requirements. There are three main types of relationships in use case diagrams:1.Actor to actor—This is the generalization relationship and represented by the inheritance arrow in Figure 6.1. This relationship was also discussed in the previous chapter (notably Figure 5.3).2.Actor to use case—The relationship between an actor and a use case is called an association, also occasionally called "communication" because it represents a communication between the actor and the system. This association is represented by a straight line in Figure 6.1. The association is an interface through which an actor interacts with the system. Occasionally, an association line may have an arrowhead (not shown in Figure 6.1), representing the actor initiating the use case. This direction on the association relationship is only shown if absolutely necessary.3.Use case to use case—There are three specific relationships permitted…
Swing Jazz Club ERD Problem Follow the Simple Procedure for ERD diagramming to design an ERD using the following user provided information. Remember the ERD will eventually turn into the design for a database from a top down view. Make sure you resolve any many to many conflicts. Label an identifier or primary key and all pertinent attributes given. If an attribute is not readily apparent from the user information, then make one up that makes sense for the particular entity. Therefore, all entities should end up with at least an identifier and another attribute that makes sense. You may use any of the approaches shown by the book, though the ER-Model and Crow’s foot are the most common. Make sure you show entities, relationships, cardinality, and optionality. Swing Jazz Club The Swing Jazz Club teaches swing and jazz dancing and offers both private and group lessons. Swing Jazz charges $60 dollars per hour for a private lesson and $10 dollars per hour for a group lesson.…
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An aggregation relationship in the domain model suggests the application of the Question options: creator pattern singleton pattern controller pattern expert pattern

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In a class UML diagram, general relationships should be labelled with O cardinality O a relationship name direction of the relation all of the above