Chapter 1

PB204 Jabatan Perdagangan POLITEKNIK SEBERANG PERAI DATABASE APPLICATION

INTRODUCTION TO DATABASE SYSTEM 1.0

Concept of Database System ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Garbage in Garbage out Data integrity is lost

Data and Information ,[object Object],Useful Accessible Organized Timely Verifiable Accurate Cost-effective

Data and Information (cont.) ,[object Object],[object Object],[object Object],Commerce Department Database Student Class File field Names records fields maximum characters in student matric no field Characteristics of Matric No Field Matric No Name Date Of Birth 10DPM10F1101 AZRI BIN ALI 30.4.1992 10DPM10F1102 FATIMAH BT ABDULLAH 18.6.1992 10DPM10F1103 FARISHA BT ZAHID 28.8.1992 Field size 12 format Input mask Caption Matric No Default value Validation rule Validation text required Yes Allow zero length No Indexed Yes (No Duplicate)

Data and Information (cont.) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Students class file Data types Matric No Text Name Text Date Of Birth text

Data and Information (cont.) ,[object Object],Yes/No (also called Boolean)—only the values Yes or No (or True or False) Hyperlink Web address that links to document or Web page Object also called BLOB for binary large object)—photograph, audio, video, or document created in other application such as word processing or spreadsheet Currency dollar and cent amounts or numbers containing decimal values Date month, day, year, and sometimes time Memo lengthy text entries Text (also called alphanumeric)—letters, numbers, or special characters Numeric numbers only AutoNumber unique number automatically assigned to each new record

Data and Information (cont.) ,[object Object],Group of related fields Key field , or primary key , uniquely identifies each record

Data and Information (cont.) ,[object Object],[object Object],fields Key field records NO. PEND NAMA PELAJAR NO. HP PELAJAR NAMA SYARIKAT KOD SYARIKAT 10DAT09F1017 SOO HUI YING 0164697289 LIANG & CO P1531 10DAT09F1019 LAU XIN HUI 0124318638 TAN YEN WOOI & CO_01 P1532 10DAT09F1021 HONG CHING SHING 0164702233 THAM & CO P1533 10DAT09F1022 TAN IE VON 0166925719 CHUAHBOON CONSULTING SDN BHD P1534

Data and Information (cont.) ,[object Object],[object Object],[object Object],[object Object],[object Object]

Data and Information (cont.) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Data and Information (cont.) ,[object Object],[object Object],[object Object]

Data and Information (cont.) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Data and Information (Cont.) ,[object Object],Database software allows you to Collection of data organized so you can access, retrieve, and use it Database software also called database management system (DBMS) Add, change, and delete data Create database Sort and retrieve data Create forms and reports

Purpose of Database Systems ,[object Object],[object Object],[object Object],[object Object],Reduced data redundancy Improved data integrity Shared data Easier access Reduced development time

Purpose of Database Systems (cont.) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Purpose of Database Systems (Cont.) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Database Management System (DBMS) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Database Management System (DBMS) (Cont.) ,[object Object],[object Object],[object Object],[object Object],[object Object]

Database Management System (DBMS) (Cont.) ,[object Object],[object Object],[object Object],Query Optimization and Execution Relational Operators Files and Access Methods Buffer Management Disk Space Management DB These layers must consider concurrency control and recovery

Database Management System (DBMS) (Cont.) ,[object Object],Personal computer, midrange server, mainframe IBM Corporation DB2 Personal computer, midrange server, mainframe IBM Corporation Informix Server Microsoft Corporation SQL Server Personal computer, midrange server, PDA Sybase Inc. Sybase Personal computer, midrange server, mainframe, PDA Oracle Corporation Oracle Personal computer, midrange server, mainframe Computer Associates International, Inc. Ingres Personal computer, server, PDA Microsoft Corporation Access Computer Type Manufacturer Database

Database Management System (DBMS) (Cont.) ,[object Object],1. Determine the purpose of the database 4. Determine the relationships among the tables ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],3. Design the records and fields for each table 2. Design the tables

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