computer Flashcards
queries and ewan basta yun
it is important to have plans or models first. In construction, these plans are called
BLUEPRINTS
The traditional houses in Alaska
IGLOOS
Those found in southern native American reservations
TEEPEES
are plans drawn to scale. They are used by architects, engineers, plumbers, and electricians as guides when constructing a house or a building. A blueprint contains a site plan, a foundation plan, floor plans, and other construction details. A house cannot be built without a blueprint. Without it, a wall might be constructed unevenly and could be a safety hazard. Just like blueprints, the idea of building a data model before you start with a database is important, since a data model is an abstract way of describing how data are organized.
BLUEPRINTS
are blocks of ice shaped into a dome
IGLOOS
tent poles arranged into a conical frame with animal skins (usually buffalo hide) bound tightly over it
TEEPEES
(Native Eskimo House)
IGLOO
(Native Filipino House)
BAHAYKUBO
(Native American House)
TEEPEE
used to represent data in a way that is close to the user’s view of the model environment.
Object-Based Logical Model
a primary example of the Object-based logical model. It is represented through the entity-relationship diagram.
Entity-Relationship Model
consists of a set of basic objects that are called entities and their relationships
E-R Model
described in the database by a set of attributes
entity
USED Such is the case for the student attribute Name, which has three composite attributes – Last Name, First Name, and Middle Name.
composite attributes