Chapter 2 Data Models Chapter 2Data Models Answers to Review Questions 1. Discuss the importance of data modelling. A data model is a relatively simple representation, usually graphical, of a more complex real world object event. The data model’s main function is to help us understand the complexities of the real-world environment. The database designer uses data models to facilitate the interaction amongdesigners, application programmers, and end users. In short, a good data model is a comm
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(FIS) SPRF#400019173 Reversal Correction - HLD [pic] Version 1.7 Version Created on 6/01/2009 Table of Contents 1. Revision History 4 2. Overview 5 2.1 Purpose 5 2.2 Scope 5 2.2.1 In Scope 5 2.2.2 Out of Scope 5 2.3 Assumptions 6 2.4 Reference 7 2.5 Functional Description – Reversal-Correction Process 8 2.5.1 Functional Overview 8 2.5.1.1 Current State Data Flow Diagrams 8 2.5.1.2 Future State Data Flow Diagrams 12
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ABSTRACT 1.0INTRODUCTION 2.0 CURRENT ISSUES / CHALLENGES 2.1 Archives as constructed memory Archives are basically known as a place or building where permanent records are or may be stored. Those records are actually all being kept in memory in the archives. The memory usually known as separated parts such as personal memory, collective (social) memory, historical memory and archival memory. The aim of memory existence is to enable people searching for information from the past
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structured query language (SQL) 7. People naturally have an integrated view of the data in their environment. This leads to a new problem that has evolved with the use of spreadsheets and desktop databases. This problem is users lack proper data-modeling and database design skills. Chapter 2 8. This type of data model was developed in the 1960’s to manage large amounts of data. It contains multiple levels of segments where the higher level is a parent and the lower level a child : Hierarchical
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Computer Science Chapter 1: Introduction to Computer Hardware Different Categories of Computer and Computing Devices Tablets The lightest and most portable Touch interface, good for “light” work Laptops/Notebooks Larger display area; adds CD or DVD as well as physical keyboard They are portable; price for performance is not as good as desktop, choice of hardware is limited Specialized Variant Laptops Ultrabooks Thinner, and lighter than laptops Cost is higher than laptop (all
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Metadata CustTable Central client register table. Statistic and setup values are defined in this table. | Field name | Data type | Field description | AccountNum | NUMBER(5,0) | Unique identifier of a customer | Name | VARCHAR2(50) | Name of the customer. This name is printed on documents, such as invoices and account statements. | InvoiceAccount | NUMBER(5,0) | Invoice account, to which the customer is linked. The invoice account is the account to which the invoice amount is debited
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following terms: a. Data b. Field c. Record d. File 2. What is data redundancy, and which characteristics of the file system can lead to it? 3. What is a DBMS, and what are its functions? 4. What is a business rule, and what is its purpose in data modeling? Given the file structure shown in Figure T1.1, answer Problems 5 - 8. FIGURE T1.1 The File Structure for Problems 5-8 5. How many records does the file contain, and how many fields are there per record? 6. What problem would you encounter
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Database Concepts - Final Exam B 1. Redundancy refers to what database condition? The same data is recorded in more than one place in the same database. You have more than one database devoted to the same thing. 2. Which statement best describes the function of a primary key? It uniquely identifies each record. 3. Which statement best describes the function of a foreign key? A foreign key is the primary key of one table repeated in another table in order to create a
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* Courses & Groups My CoursesView All or Customize (5) * DANC 100 - Ballet Fundmtls for Non-Majors (27745)Winter 2016 Web Enhancedenrolled as: Student * DS 265 - Business Statistics I (M1)Fall 2015 Web Enhancedenrolled as: Student * EMU Student Canvas GuideMaster Coursesenrolled as: Student * IS 215 - Information Systems for Busine (21546)Winter 2016 Web Enhancedenrolled as: Student * LAW 293 - Legal Environment of Bus (26954/26955/26956)Winter 2016 Onlineenrolled
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management, performance monitoring/tuning and backup and recovery. Many database management systems are also responsible for automated rollbacks, restarts and recovery as well as the logging and auditing of activity. * Data modeling vs Database structure Data modeling is often the first step in database design and object-oriented programming as the designers first create a conceptual model of how data items relate to each other while a data structure is a specialized format for organizing and
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