introduction to database tonga institute of higher education nos 215

Introduction to Database

Tonga Institute of Higher EducationNOS 215

Topics

Database Database Management System

(DBMS) Advantage of a Database

management systems

Database

A Database is a collection of related data that has been organized to allow easy access. Eg

Telephone book

Database

In computing, a file system is a method for storing and organizing computer files and the data they contain to make it easy to find and access them

In a flat file system, everything is stored at the same level on the media

What is meant by Database Management Systems (DBMS)

A DBMS is a computer software package which provide the user with a set of powerful tools for Storing Retrieving, Editing Sorting Presenting Manipulating

data easily and quickly as required

Database Management Systems

DBMS enables the user to: Create a Database Add, edit and remove data from

database View and modify the database Create reports Derive a specific output such as

displaying only certain criteria

DBMS Applications

Maintain general records - such as name and contact.

Stock Maintenance – include retail items in store.

Cataloguing items such as books in a Library

Preparing mailing List And so on

RDBMS

Proposed by Ted Codd 1970 Any data can be stored in a form of

a table called Relation. Later companies base on Codd’s

proposal, develop what we now called Relational Database.

Relational Database management Systems (RDBMS)

Most powerful DBMS use what is called a “relational” database structure.

“Relational” means that relationships can be found and created between different sets of data.

Example

You might have a set of data about students and one about classes.

If the class table saved who was in the class, you could look up and see where that student lived, using the student table. This is a relationship

Relational Database management Systems (RDBMS)

Stores Data in many related tables It allows you to ask questions

utilizing data from one or more table

Receive answers as queries, forms and report.

DBMS Packages

Access (Windows) Approach (Windows) dBASE III PLUS and dBASE IV Foxpro Paradox Quest

Task

Not count for final assessment but for your own good

Find other database packages.

Database Terminology

Data management software (databases) help organize, sort, store, and update data.

A “record” holds the data for a single entity. If we had a database for students, a single

“record” would save all the information about one student

A “field” holds one item of data called attributes. The students name would be a field. So would his

age, or address

Database Term

Each information on a Card eg address is called a field

Each Card is called a record

All Cards make up the Customer File

View in a Table format

Customer F/Name Address Suburb Postcode Phone

Anderson Julie 14 Pool Street

Research 3149 437 8408

Advantage of DBMS

In terms of storing – All the old records can be replaced by one computer

In term of searching – easily speedily and efficiently search.

And others

Summary

Database Database Management System Advantages