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 part 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 community ModelThe Relational ModelThe Relational version and sensible DependenciesFundamental Relational DatabaseRelational Database and SetsFunctional. 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 part 1: Get the necessities for the Database section 2: Specify the Database section three: layout the DatabaseData and knowledge ModelsFiles, documents, and information 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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Extra resources for Database Design Using Entity-Relationship Diagrams, Second Edition
Further, as the database becomes more complicated, the paths of connections and the maintenance problems become exponentially more difficult to manage. As a project, you could create the Person-Sports database with a few more records than given in the example using linked lists. At first, you might think this to be a daunting exercise, but one of the most popular database systems in the 1970s used a variant of this system. The parent and child records were all linked with linked lists going in two directions—forward and backward.
In our presentation, we will think of ourselves as the analyst trying to enunciate what the users think they want. Recall the example in this chapter in which your mother asked you to draw up a list of items in a home library. Here, the mother is the user; the person drawing up the list of objects is the analyst. There is no general agreement among software engineers regarding the exact number of steps or phases in the waterfall-type software development model. Models vary depending on the interest of the SE-researcher in one part or another in the process.
While this linked list system may look somewhat fragile, it formed the basis for several of the most successful commercial databases. As you might expect, enhancements to the basic linked list included things like direct links back to the parent, forward and backward links, links that skipped along the chain in one direction and not in the other (coral rings). All these enhancements were the fodder of databases in the 1970s. 2 Relationship Terminology Having seen how to implement relationships in hierarchical databases, we need to tighten some language about how relationships are formed.