COB 204 Chapter Notes - Chapter 3: Database, Foreign Key, Unique Key
29 Jan 2016
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Document Summary
Clickstream data: are those data that visitors and customers produce when they visit a website & click on hyperlinks. Data file: a collection of logically related records. Data hierarchy: bit: (binary digit) represents the smallest unit of a data a computer. Ex. the student"s name, the courses taken, the date and the: data table or file: a logical grouping of related records grade. Database management system (dbms): a set of programs that provides users with tools to create and manage a database. Relational database model: is based on the concept of two-dimensional table relationships. Data model: a diagram that represents entities in the database and their. Entity: a diagram that a person, place, thing, or event such as a customer, an employee, or a product about which information is maintained. Instance: of an entity refers to each row in a relational table, which is a specific, unique representation of the entity. Attribute: each characteristic or quality of a particular entity.
