Relational Dialectics was originally proposed by Leslie A. Baxter and W.K. Rawlins but Leslie edited the theory with Barbara M. Montgomery. It is an interpersonal communication theory about close personal ties and relationships that highlights the tensions‚ struggles‚ and interaction between opposing tendencies (Baxter and Montgomery‚ 1998). Baxter and Montgomery elaborated on Mikhail Bakhtin’s idea that life is an open monologue and that individuals experience discourse between opposing desires
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Research Paper University of Maryland University College CMIS 320 6381 Relational Database Concepts and Applications Professor Kevin W….. By Bob Bobson March 7‚ 2014 Introduction In order to successfully transition from our current paper and email based equipment request method to a completely paperless online system‚ we must build and implement a relational database. A relational database will allow us to store‚ filter‚ make changes to‚ and share of the data that
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Institute of graduate studies &research Information technology department Database systems Report on: (Comparison between Relational database & object oriented database) By: Mohammed Hussein Mahmoud Mustafa khedr To: Dr. Saad Darwish Introduction A database is a means of storing information in such a way that information can be retrieved from it. Thus a database is typically a repository for heterogeneous but interrelated pieces of information. Often a database contains more than one
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Database Models and Legacy Systems The evolution of the information age demanded robust management systems for storing large volume of data‚ efficiency in retrieval‚ and enhanced data security and sharing; hence‚ the development of databases from flat file systems. Despite this advancement in technology‚ many organizations such as Colorado Financial Reporting System (COFRS) continue to use legacy database systems. Colorado Financial Reporting System (COFRS) The Colorado Financial Reporting
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The Physical Data Model (PDM) describes how the information represented in the Logical Data Model is actually implemented‚ how the information-exchange requirements are implemented‚ and how the data entities and their relationships are maintained. There should be a mapping from a given Logical Data Model to the Physical Data Model if both models are used. The form of the Physical Data Model can vary greatly‚ as shown in Figure 31. For some purposes‚ an additional entity-relationship style diagram
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The Evolution of Data Models The quest for better data management has led to different models that attempt to resolve the file system’s critical shortcomings. Because each data model evolved from its predecessors‚ it is essential to examine the major data models in roughly chronological order. 1.1 The Hierarchical Model A Hierarchical Database Model is a data model in which the data is organized into a tree-like structure. The structure allows representing information using parent/child relationships:
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based on data model or structure: navigational‚ SQL/relational‚ and post-relational. The two main early navigational data models were the hierarchical model‚ epitomized by IBM’s IMS system‚ and the Codasyl model (Network model)‚ implemented in a number of products such as IDMS. The relational model‚ first proposed in 1970 by Edgar F. Codd‚ departed from this tradition by insisting that applications should search for data by content‚ rather than by following links. The relational model is made up of
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non-technical readers. The methodology for relational Database Management Systems is presented in simple‚ step-by-step instructions in conjunction with a realistic worked example using three explicit phases—conceptual‚ logical‚ and physical database design. Background: Introduction to Databases; Database Environment; Database Architectures and the Web. The Relational Model and Languages: The Relational model; Relational Algebra and Relational Calculus; SQL: Data Manipulation; SQL:
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Entity-Relationship (E/R) Model Dr P Sreenivasa Kumar Professor CS&E Dept I I T Madras Entity-Relationship (E/R) Model Widely used conceptual level data model • proposed by Peter P Chen in 1970s Data model to describe the database system at the requirements collection stage • high level description. • easy to understand for the enterprise managers. • rigorous enough to be used for system building. Concepts available in the model • entities and attributes of entities. • relationships between
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1 Encryption is method of scrambling data in some manner during transmission. In periods of war‚ the use of encryption becomes paramount so those messages are not intercepted by the opposing forces. There are a number of different ways to protect data during transmission‚ such as Substitution (character for character replacement) in which one unit (usually character) of cipher text (unintelligible text or signals produced through an encryption system) is substituted for a corresponding unit of plain
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