chapter 6-information system
TRANSCRIPT
Chapter 6
INFORMATION SYSTEM
Concepts of Information System
Data
•Are the raw ,unprocessed facts,including text,numbers,images and sound
•It is not organised and has little value
Informations
•It is organised data
•It is valuable and meaningful to a specific user
Information
system
•Collection of hardware,software, data,people, and procedures
•It collects data, processes data and provides information
General Usage Of Information System In Various fields
•Keep track of students statistics and grades
•Help students and teachers in online learning and discussion.
Educations
•Carry our online buying and selling
•Help plan the delivery of goods and services.
Business
•See employee records
•Analyse products,services and products prices
Management
Informations System
Components
Hardware
Software
People
Data
Data Are the raw Unprocessed facts,including text,numbers,images and sound Processed data is called information
Hardware Is the equipment that processes the data to create information. It includes keyboard,mouse,monitor,system unit and other
devices.
Software Is series of instructions that tells a computer what to do The purpose is to convert data into informations
People Is anyone who communicate with computer or utilizes the
information it generates
Five types of informations systems
Transactions processing System
(TPS)
Management Information System
(MIS)
Expert System (ES)/ Artifical
Intelligence (AI)
Executive Information
System(EIS)
Decision Support System(DSS)
Hierarchy of Data
EIS(Making decision)
DSS (Analyze)MIS(Summarize)
TPS (Record)
Top Management
Middle Management
Supervisor
Meaning•A
binary digit,the smallest piece of information yhat a computer can hold
•Always one of two values,written as 1 or 0
Bit
•Is series of 8 bits
•Which represent a single character(number,symbol,letter)
Byte
•Combinations of one or more character or bytes
•Are smallest units of information
field
•Is a collection of related fields
•Each record is represented by a row in the table
Record•Colle
ction of related data
File (table)
•Collection of related files
•Stored in storage medium
database
SOFTWAREDEFINITION
Database Is a structured collection of data Is organized so that enables people to add,find
sort, group,summarize,and print the data.
DBMS Is a software that can manage a database Allows to use a computer to create a
database,add and delete data in the database.
Benefits of using DBMS
1. Improved Data Integrity2. Avoid data redundancy3. Data can be shared over a network4. Information can be accessed easily5. Data Security
Definition
• Is a field that contains a value
• Uniquely identifies each record in the table
Primary key
• Is a field in a relational table that matches the primary key column of another tableForeign
key
Importance of primary key
1. Ensures that no two records ina database contains the same value for that fields
2. Uniquely identifies the records For example: IC number Field uniquely identifies
each students because no two students can have the same IC numbers
Database Objects
Table Form Query
Report Relationship
Basic Operations of Data Manipulation
update
Insert Search
modify Filter
Delete Sort
Retrieve
Usage Of basic Operation
•To update records
Update
•To Insert new records
Insert/Add
•To delete records
Delete
•To modify records
Modify
•To retrieve records
Retrieve
•To sort records whether ascending or descending
Sort
• List one or more records using certain condition Filter
• Find records according using certain conditionsSearch