INFORMATION_SYSTEMS FORM 5

 

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INFORMATION_SYSTEMS FORM 5

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LA6: Information Systems 6.1 Concepts of Information Systems 6.1.1 Definition 6.1.1.1 Meaning of data, information and information systems. Data Information Information System : Raw and unorganised materials that have little value : Organised data that are useful to a specific user : A set of related components that collect data, process data and provide information 6.1.2 Usage of Information Systems in Various Fields 6.1.2.1 Usage Of Information Systems in education, business and management. Education: 1. To individual (Student / Teacher) 2. To organizations (School) 3. To the nation Business 1. To individual 2. To organizations 3. To the nation Management: 1. To individual 2. To organizations 3. To the nation : Analyse product, services and product prices : Process customer orders , organise production times and keep track of product inventor : See employee records : Make hotel room bookings and for checking the best rates : Help plan the delivery and services : Carry out online buying and selling : Helps in online learning and discussion : Keep track of students statistic and grades : Store subject contents

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6.1.3 Information Systems Components 6.1.3.1 List the Information System Components 6.1.3.2 Information System Components definition Components Data Hardware Software People Procedure Definition Raw and unorganised data with little value that helps user to make the right decision Computer equipment that are used for processing and output functions Programs that allow the computer to carry out most of the instructions related to information processing Personnel and end users of information system Operating instructions for information system user 6.1.3.3 Interrelations between Information System components DATA INFORMATION HARDWARE PEOPLE PROCEDURE 1. Interrelation between data and hardware. Hardware process data using processor into useful information 2. Interrelation between hardware and people. People input data into the computer using hardware to be processed by the processor 3. Interrelation between people and procedure. People follow procedure to make information system function 4. Interrelation between software and data. Carry out instructions to turn data into useful information 5. Interrelation between procedure and software. People use procedure to make information software function properly.

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6.1.4 Types if Information Systems 6.1.4.1 Five types of Information Systems. 6.1.4.2 Usage of each type of Information System. Information Systems Management and Information System (MIS) Transaction Procession Information (TPS) Decision Support System (DSS) Executive Information System (EIS) Expert System (ES) Usage Provides regular information about daily activities of a database. Keep track of daily transaction in a database Help to analyse information, recognise problems and making decisions Forecast future trends Store knowledge and make logical suggestion for user

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6.1.5 Hierarchy of Data 6.1.5.1 Bit, byte, field, record and file definitions Bit : Smallest unit of data the computer can store that consist of binary 1 and 0 for ON and OFF. Byte : Collection of eight bits. A byte represents a character. Field : Unit of data consisting of one or more character. Record : A collection of related fields. File : A collection of related records. 6.1.5.2 Hierarchy of data. Hierarchy? Meaning: A series of ordered grouping in system, beginning with the smallest unit to the biggest Files Records Fields Bytes Bits

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6.2 Software 6.2.1 Definition 6.2.1.1 Database and Database Management Systems (DBMS) definitions: 1. Database: Structured collection of information on specific subjects. It is an electronic filing system. 2. Database Management Systems (DBMS): A software package that accesses information from the database. It acts as an interface between the database and the user that will enables the user to extract, modify and store information from the database. 6.2.1.2 Benefits of the using database: 1. Minimize data redundancy - because there is no need to repeat recording the same data. 2. Data integrity is assured - because when a user modifies data in one of the files in the database, all the same data will be automatically updated. 3. Data can be shared with the whole organisation by network. 4. Information can be accessed easily - and everyone that has the access can modify and manage data in database.

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6.2.2 Features 6.2.2.1 Relationship between attribute (field), row (record) and relation (file). 1. Vertical : field 2. Horizontal 3. All : record : file 6.2.2.2 Primary key and foreign key definition:  Primary key  Foreign key : A key that uniquely represent each record in a table. : Field that matches the primary key in the other table. 6.2.2.3 Importance of primary key 1. Ensure data integrity by identifying each record 2. Helps to avoid duplicating record 3. Prevents null values from being entered in the unique field 6.2.2.4 Primary key and foreign key differences Primary Key Must have unique values Unique value that represent each record in a table Foreign Key Can have duplicate values. Foreign key links to a primary key in another table. - -

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6.2.3 Database objects 6.2.3.1 Definitions of table, form, query, report. 6.2.3.2 Description of table, query, form and report as database object/tools Database objects and their description: Tables : Stores collections of information about specific topic. Query : Request specific data from database. Form : Interface for user to enter information into the database. Report : Summaries information from the database.

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6.2.4 Data manipulation 6.2.4.1 Basic operations of data manipulation 6.2.4.2 Usage of basic operations in data manipulation. Update Insert / add Delete Retrieve Sort Filter Search – Used for changing data in table – Used in adding records in the table – Used for removing records from table – Used for retrieving records from table – Used for sorting records in table – Used for filtering records from table – Used for finding records from table

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6.3 Database Development 6.3.1 Phases of System Development i. ii. iii. iv. v. vi. Analysis Phase Design Phase Implementation Phase Testing Phase Documentation Phase Maintenance Phase 6.3.1.1 Phases of System Development 1. Analysis phase: System developers perform analysis by finding out the need of target user and then identify the input, process, and output for the new system. 2. Design phase: System developers design an Entity Relationship Diagram (ERD) based on the target user needs. 3. Implementation phase: System developers create database using database software in this phase. 4. Testing phase: Target users test the database to see if there are any errors. If errors are detected, system developers will fix it. 5. Documentation phase: System developers create documents for the programs. 6. Maintenance phase: System developers continue to provide support, monitor performance and make changes to the system when it is needed.

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6.3.2 Develop a Database Project 6.3.2.1 Project Identification Project Title: 5 Bestari Student Profile 6.3.2.2 Project Requirement Project Requirement: 1. Student ID 2. Student Name 3. Student Address 4. Student Telephone Number 5. Co-curriculum activities 6. Position in Co-curriculum 6.3.2.3 Project Requirement Tables Name of the table STUDENT Student ID Student Name Student Address Student Telephone Number CO-CURRICULUM Co-curriculum Activities Position in Co-curriculum Student ID Field Name 6.3.2.4 Database tables design Table Field Name Data Description

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STUDENT Cocurriculum Student ID Student Name Student Address Student Phone No Student ID Co-curriculum Activities Position In Co-curriculum Activities Type Number Text Text Number Number Text Text Store student ID Store student name Store student Address Store student phone no Store Student ID Store student co-curriculum activities Store student position in cocurriculum activities 6.3.2.5 Database “File Name”: 6.3.2.6 Tables Name of the table Primary Key Field Name STUDENT Student ID Student Name Student Address Student Phone Number CO-CURRICULUM Co-curriculum Activities Position in co-curriculum activities 6.3.2.7 Relationship between tables STUDENT Student ID Student Name Student Address Student Phone Number 6.3.2.8 Data Student ID CO-CURRICULUM Co-curriculum activities Position in co-curriculum activities 6.3.2.18 Enter data into the table Number of records entered Table STUDENT 6 Table CO-CURRICULUM 10

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6.3.2.9 Form Create a form: 6.3.2.10 Query Criteria for query: 6.3.2.11 Report Name of the report:

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