Microsoft Access 1. Database Creation and Management. Basic DB Terms. Data : Meaningful facts, text, graphics, images, sound, video segments A collection of individual responses from a marketing research Information : Data processed to be useful in decision making
Microsoft Access 1
Database Creation and Management
Data in Context
Large volume of facts, difficult to interpret / make decisions
Useful for decision making / interpretation
Descriptions of the properties or characteristics of the data, including data types, field sizes, allowable values, and documentation (Data Dictionary)
A schematic diagram of a relational database (a) and a sample part of a relational database showing different tables (b)
1. There are no duplicate rows.
2. Rows are unordered (top to bottom).
3. Columns are unordered (left to right).
4. Every value isatomic.
The primary key in the Employer table (EmployerID) is the common field that relates this table to the Position table.
PositionID is the primary key in the Position table. The EmployerID field is a foreign key in this table.
Primary keys can only have one occurrence in a table. Foreign keys may have multiple occurrences.