Case 2: Create a class diagram for the system as tollow. A Real Estate Inc. (AREI) sells houses. People who want to sell their houses sign a contract with AREI and provide information on their house. This information is kept in a database by AREI, and a subset of this information is sent to the citywide multiple listing service used by all real estate agents. AREI works with two types of potential buyers. Some buyers have an interest in one specific house. In this case, AREI prints information from its database, which the real estate agent uses to help show the house to the buyer (a process beyond the scope of the system to be modeled). Other buyers seek AREI's advice in finding a house that meets their needs. In this case, the buyer completes a buyer information form that is entered into a buyer database, and AREI information to search AREI's database and the multiple listing

Case 2: Create a class diagram for the system as tollow. A Real Estate Inc. (AREI) sells houses. People who want to sell their houses sign a contract with AREI and provide information on their house. This information is kept in a database by AREI, and a subset of this information is sent to the citywide multiple listing service used by all real estate agents. AREI works with two types of potential buyers. Some buyers have an interest in one specific house. In this case, AREI prints information from its database, which the real estate agent uses to help show the house to the buyer (a process beyond the scope of the system to be modeled). Other buyers seek AREI's advice in finding a house that meets their needs. In this case, the buyer completes a buyer information form that is entered into a buyer database, and AREI information to search AREI's database and the multiple listing

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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Rock Series: A site hosts many shows a year. Artists have a name and perform several times in a series (each is a show on a different date). Series have one or more artists and have a series name and a specified seating arrangement. A series is held in one (and only one) of several halls, each of which has a hall number. Represent this situation of shows and artists with an E-R diagram.
Select the class relationship that best describes the following scenario: Class A can has a method that has no parameters. This method modifies an attribute of itself. Association (Reflexive) Association (Bidirectional) Association (Directed A to B) Association (Directed B to A) Composition (A as the whole and B as the part) Composition (B as the whole and A as the part) Aggregation (A as the whole and B as the part) Aggregation (B as the whole and A as the part) O Inheritance None of the given
Sub Class and Super Class belongs to model. a. ER b. Dimensional C. EER d. Relational Which of the following is true about Information? a. It is always useful without processing b. It is generally collection of unorganised facts c. It needs to be processed to provide answer to user queries d. It is raw Which of the following statements is true about the Composite Primary key? O a. It is composed of two or more attributes, but it must be minimal. b. It is composed of two or more relations, but it must be minimal. O c. It is composed of two or more attributes, but it must be maximal. d. It is composed of two or more entities, but it must be minimal. contains only columns that are non-transitively dependent on the primary key. a. INF b. 2NF c. 3NF d. UNF
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Instructions: Create a UML diagram for a Dog class. You can get some useful information from your book Review Chapter 5 Pg. 179-180. CLASS NAME List the instance variables in the constructor. Unified Modeling Language (UML) List the methods in the class. o - indicates private o name is the variable name o string is the data type of name CLASS NAME List the instance variables in the constructor. o + indicates public o getName is the method name o o string is the return data type List the methods in the class. The second row of the UML diagram lists the instance variables in the constructor. For example -name: string Java.util. The third row of the diagram lists the methods in the class. For example, +getName(): string empty parenthesie indicate nothing is sent to the method.
courses dasses ↑coursel INT courseDateTime DATETIME O room INT coursel INT courseName VARCHAR(45) course Description VARCHAR(45) room are used by a class. For each entity: Entitios rooms Froom DVT L-building VARCHAR(X) capacity VARCHAR(45) Inders The ERD depicts the data needed to track which course and Indicate if the entity is strong, weak ID-dependent, or weak non-ID-dependent For each relationship: • List the cardinality and participation of each entity in the relationship List the business rules for each relationship Indicate if the relationship is identifying or not
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