By Sikha Bagui
Facts, Databases, and the software program Engineering ProcessDataBuilding a DatabaseWhat is the software program Engineering Process?Entity courting Diagrams and the software program Engineering lifestyles Cycle section 1: Get the necessities for the Database part 2: Specify the Database part three: layout the DatabaseData and information ModelsFiles, documents, and information ItemsMoving from three × five playing cards to ComputersDatabase Models The Hierarchical ModelThe community ModelThe Relational ModelThe Relational version and useful DependenciesFundamental Relational DatabaseRelational Database and SetsFunctional. Read more...
summary: information, 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 part three: layout the DatabaseData and information ModelsFiles, documents, and knowledge ItemsMoving from three × five playing cards to ComputersDatabase types The Hierarchical ModelThe community ModelThe Relational ModelThe Relational version and useful DependenciesFundamental Relational DatabaseRelational Database and SetsFunctional
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Extra info for Database Design Using Entity-Relationship Diagrams, Second Edition
A different database might be about the members and activities of the Over 55 Club in town. It would be inappropriate to have data about the Over 55 Club and Acme Plumbing in the same database because the two organizations are not related. Again, a database is a collection of related data. To keep a database about each of the above entities is fine, but not in the same database. Database systems are often modeled using an entity relationship (ER) diagram as the blueprint from which the actual data are stored; the blueprint is the output of the design phase.
With a database system, one did not have to write COBOL programs to handle data directly but rather relied on the database program to handle data. With these systems, each department could share data and resources. Instead of each department having its own programmers and perhaps its own computer, there could be one central computer to store data, one programming staff, and one database software package. Data could be shared, with each department having its own view of the data. All this sounds great, but in reality it took several years to break away from the “my data” mold.
How would you go about doing this? You might grab a piece of paper and begin listing items that you see. 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.