1. Database

2. Application form

4. A Databaseis a collection of related data
•Data: known fact that can be recorded and have implicit meaning
–Eg: names, telephone numbers, student marks, etc…

5. o;a; iuqodhla hkq" tla;rd úIhlg tallhlg fyda isoaêhlg fyda iïnkaO f;dr;=re tl;=j

6. Database Management System(DBMS) is a collection of programs that enables users to create and maintain databases.
•Database System = database + DBMS

7. File Systems
•Before Mid 60’s
•Operating System’s files provide the basic means of storing information.
•Files are sufficient for applications requiring small amounts of data & mainly single-user applications.

8. Database Systems vsFile Systems
•Problems with file systems
–Data redundancy
–Integrity issues
–Required knowledge of storage details
–No standard language
–Files only provide sequential access
–Basic security capabilities (read, write, execute)

9. Evolution of Database Models
•First Generation
–Hierarchical & Network Model
•Second Generation
–Relational Model
•Third Generation
–Object Relational Model
–Object Oriented
–XML-DB

11. DBMS Data Base Management Systems o;a; iuqodh l<ukdlrK moaO;s

12. j.=jla" o;a; iuqodfha uQ,sl jia;=jls
Table : STUDENT
Primary Key
j.=jla" o;a; iuqodfha uQ,sl jia;=jls
Field
Record

18. Primary Key

19. st_no
st_name
town
tel_no
co_ID
co_name
Duration
Fees
11s
Saman
Moratuwa 10
Java 6
10,000.00
15s
Samal
Rathmalana 11
Graphics 5
12,000.00
12s
Nimal
Maharagama
13s
Kottawa 15
python
15,000.00
16s
Rani

20. foreign key Student Table Course Table st_no st_name town tel_no 11s
Saman
Moratuwa
15s
Samal
Rathmalana
12s
Nimal
Maharagama
13s
Kottawa
16s
Rani
Student Table
co_ID 10 11 15
Co_ID
co_name
Duration
Fees 10
Java 6
10,000.00 11
Graphics 5
12,000.00 15
python
5,000.00
Course Table

22. Only name and Town

23. o;a; iuqodhl m%Odk ixrpl ^jia;=& y;rla we;'
úuiqï
wdlD;s
jd¾;d

24. Query

28. Form

29. Report

31. COURSE
STUDENT

32. School
Principal
School
Teacher

33. One to one

34. One to many

35. Many to many