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Download Database Design Using Entity-Relationship Diagrams, Second by Sikha Bagui PDF

By Sikha Bagui

Info, Databases, and the software program Engineering ProcessDataBuilding a DatabaseWhat is the software program Engineering Process?Entity courting Diagrams and the software program Engineering existence Cycle part 1: Get the necessities for the Database section 2: Specify the Database section three: layout the DatabaseData and information ModelsFiles, documents, and information ItemsMoving from three × five playing cards to ComputersDatabase types The Hierarchical ModelThe Read more...

summary: facts, Databases, and the software program Engineering ProcessDataBuilding a DatabaseWhat is the software program Engineering Process?Entity dating Diagrams and the software program Engineering lifestyles Cycle part 1: Get the necessities for the Database part 2: Specify the Database section three: layout the DatabaseData and information ModelsFiles, files, and information ItemsMoving from three × five playing cards to ComputersDatabase types The Hierarchical ModelThe community ModelThe Relational ModelThe Relational version and practical DependenciesFundamental Relational DatabaseRelational Database and SetsFunctional

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Extra info for Database Design Using Entity-Relationship Diagrams, Second Edition

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4. What is the question-and-answer procedure in question 3 going to accomplish? 4 WHAT IS THE SOFTWARE ENGINEERING PROCESS? The term software engineering refers to a process of specifying, designing, writing, delivering, maintaining, and finally retiring software. Software engineers often refer to the “life cycle” of software; software has a beginning and an ending. There are many excellent references on the topic of SE (Schach, 2011). Some authors use the term software engineering synonymously with “systems analysis and design,” but the underlying point is that any information system requires some process to develop it correctly.

If we had a list of several people’s names, addresses, and genders, we would have a set of facts about several people. A database is a collection of related data. For this “set of facts about several people” to be a database, we would expect that the people in the database had something in common—that they were “related” in some way. ” In a “database of people,” one expects the people to have some common characteristic that ties them together. A “set of facts about some people” is not a database until the common characteristic is also defined.

The example is organized by record number; however, imagine 300 or more customers. You want to find Smith’s address— you would have to know the record number. It makes more sense to organize this file of 3 × 5 cards by name. 1 1. What does it mean to say a field has unique values? 2. Why is it desirable to have a key be unique? 3. Why does a file have to be organized by a key field? 4. What does null mean? 5. Consider this customer file: Record 1: 77 A St Adams, A Record 2: Charles, X 555-1234 365 Broad St Harris, H Record 3: Pensacola FL 555-8214 555-5847 92 Adams Lane Elberta, AL Mobile AL What is wrong here?

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