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

By Sikha Bagui

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

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

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

Sample text

What happened if a new field was required that was not on existing forms or cards? Such was a data-processing dilemma of the past. When computers began to be used for businesses, data was stored on magnetic media. The magnetic media were mostly disks and tapes. The way data was stored and retrieved on a computer started out like the 3 × 5 cards, but the data was virtual; it did not physically exist where you could touch it or see it without some kind of software to load and find records and some kind of display device to see what the “3 × 5 card” had on it.

There is often a “learning curve” necessary for the analyst as the user explains the system he or she knows so well to a person who may be uninformed of their specific business. 2 Phase 2: Specify the Database Phase 2 involves grammatical descriptions and diagrams of what the analyst thinks the user wants. Database design is usually accomplished with an ER diagram that functions as the blueprint for the to-be-designed database. Since most users are unfamiliar with the notion of an ER diagram, our methodology will supplement the ER diagram with grammatical descriptions of what the database is supposed to contain and how the parts of the database relate to one another.

When you are done, you would have a database of items in the pantry. Simple enough, but is it a good database or a poor one? Was your approach to database construction a good methodology or not-so-good methodology? The answer to these questions would depend on why you constructed the list—who will use the list and for what. If you are more methodical, you might first ask yourself how best to construct this database before you grab the paper and begin a list of items. A bit of prethinking might save time in the long run because you might think about how the list was to be used and by whom.

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