HIERARCHY OF DATA

HIERARCHY OF DATA

• Hierarchy is a series of ordered groupings in a system, beginning with the smallest unit to the largest.
• Data is organised in a hierarchy that begins with the smallest to the largest unit of data, as it progresses up the hierarchy.
• Together, bits, bytes, fields, records, files and database form the hierarchy of data.

BIT, BYTE, FIELD, RECORD AND FILE

The bit is represented by 0 for OFF or 1 for ON. It is a binary digit. It is the smallest unit of data the computer can store in a database.

A byte is a collection of bits. Each byte consists of eight bits. Each byte represents a character.

For example : The letter S is made up of 0101 0011

A field is a unit of data consisting of one or more characters (bytes).

A field is the smallest unit of meaningful information in the database. Each field has a field name.

The field name describes the data that should be entered into the field, such as StudentID (Student ID), Name, Address and MyKad Number.

A record is a collection of related fields.

Example : Each record stores data about a students.

For example, a student record is a collection of fields about a student.

A file is a collection of related records. For example, a student file is a collection of students’ records.

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 Others Lesson : | click lesson to view |

• Definition of Data, Information And Information System
  
• Usage Of Information System
• Information System Component
• Type Of Information System
• Hierarchy Of Data