TERMINOLOGIES

In studying Databases the following Terminologies must be clear

Data

lThis is the fact or facts about specific entity (person, place or thing).

Information

lThis is the processed facts perceived to be useful by the user. 

Field

lThis is a single item of information or data in entity.  E.g. employee Name

Record

l This can be defined as data or group of fields about an entity. E.g. employee particulars 

Subject (relation or table)

lThis can be defined as a collection of records that are related to a particular entity. For example, Records for all employees will make up one subject.

¡ History of Databases

¡Manual systems

¡File Processing Systems (FPS)

¡Database Management systems (DBMS)

1.  MANUAL SYSTEM:

Before the advent of the ideas behind the modern database systems, it was common for different firm to store information using manual system.

Structure for manual system

•Information can be stored in a separate rooms

•Rooms will be furnished with selves, diff shelves will hold records for different subjects.

•Records will be stored in a hard files, each fill will carry one record

•Each file will have a specific number to identify

•A person will use the file number to retrieve the specific file (record)

•

Manual systems

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