91.3902 Database Systems Assignment #1 1. Discuss the role of a high-level data model in the database design process. High-level data models assist in conceptual design and helps express data requirements of the users and includes detailed descriptions of the entity types‚ relationships‚ and constraints. The high-level data model is also used as a reference to ensure that all users’ data requirements are met and that the requirements do not include conflicts. 2. List the various
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1.a) DATA FLOW DIAGRAM Data flow diagrams illustrate how data is processed by a system in terms of inputs and outputs.Data flow diagram are used widely for modeling the requirements.the DFD is also known as a data flow graph or a bubble chart. Data Flow Diagram Notation We can use two different types of notations on our data flow diagrams: Yourdon & Coad or Gane & Sarson. Process Notations 1) Process A process transforms
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Project on Online examination 2011 SYNOPSIS This document is meant for describing all the features and procedures that were followed while developing the system. This document specially mentions the details of the project how it was developed‚ the primary requirement‚ as well as various features and functionalities of the project and the procedures followed in achieving these objectives. Online Examination System forms the lifeline of the Educational Institutes to the functioning of the Examination
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instance your entry in the database could point to several entries for each of the phone numbers that are yours. The ER model would say that you are an entity‚ and each phone number is an entity‚ and the relationship between you and the phone numbers is ’has a phone number’. Diagrams created to design these entities and relationships are called entity–relationship diagrams or ER diagrams. CONCPETUAL SCHEMA Conceptual Schema is sometimes called logical schema. It describes the stored data in terms of
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The entity-relationship model (or ER model) is a way of graphically representing the logical relationships of entities (or objects) in order to create a database. entity type is a collection of entity instances sharing similar properties Strong Entity Vs Weak Entity An entity set that does not have sufficient attributes to form a primary key is termed as a weak entity set. An entity set that has a primary key is termed as strong entity set. A weak entity is existence dependent. That is the
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Netflix Case Study Analysis Hesham Elakbawy‚ Ashley Guzman‚ Sa-ad Iddrisu‚ Emmanuel Kingsley‚ and Edna Semblay EXECUTIVE SUMMARY Netflix was founded in Scotts Valley‚ California‚ in August of 1997 by CEO Reed Hastings and Marc Randolph. In the late-nineties‚ internet retailing was in its infancy and the climate was just right for Netflix to embark on the DVD business. Few competitors were also in the business‚ encouraging the company to establish their brand name. Since they were
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Model—plan or diagram that used to make or describe something How is your firm competing in the market place? Business Model—its plan or diagram for how it competes‚ uses it resources‚ structures its relationships‚ interfaces customers‚ and creates value to sustain itself on the basis of the profits it generates A business model goes beyond your own wall. It is not just within your company. In Dell’s case‚ it needs the cooperation of its suppliers‚ customers‚ and many others to make its business
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then 6.7 and 6.9 of your textbook. ASSESSABLE TASKS OF THE WEEK Objectives: To further understanding some database concepts and principles Practice creating and investigating and resolving issues with ER Diagrams Introduction to normalisation ER Diagram 1) The following ER diagram has a number of problems. Identify the problems and discuss the ways in which to solve them. 2) Resolve the following many-to-many relationships: a) b) 3) Given
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t ;{ IJJ q U ASSTGNMENT QUESTTONS L What are the chief elements ofApple’s overall competitive strategy? How well do the pieces fit together? Is the strategy evolving? 2. What are the key elements ofApple’s strategy in computers‚ personal media players‚ tablet computers‚ and smartphones? Have its strategies in its core businesses yielded success? Explain. 3. What does a competitive strength assessment reveal about Apple’s computer business‚ as compared to the leaders in the computer industry
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maintenance and retrieval are in perfect harmony and speedy. Sample SQL-based queries executed on the designed system are also demonstrated. Keywords- Database system‚ entity relationship relational model‚ normalization‚ SQL-based queries. Introduction diagram‚ Mohammad Saber Department of Computer Science and Engineering Ahsanullah University of Science and Technology (AUST)
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