PB204 Database Application Jabatan Perdagangan Politeknik Seberang Perai

1. PB204 Jabatan Perdagangan POLITEKNIK SEBERANG PERAI DATABASE APPLICATION

2. DATA MODELLING 2.0

6. Entity Relationship Diagram (cont.) Student A ENTITY SET : STUDENT Student B Student B Mr A Mr B Mr B ENTITY SET : TEACHER RELATIONSHIP SET : SUBJECT

11. ONE TO MANY A B a1 a4 a2 a3 b4 b3 b2 b1

12. MANY TO ONE A B b2 a1 a2 a5 b3 b2 b1 a3 a4

13. ONE TO ONE A B a1 a2 a3 a4 b4 b3 b2 b1

14. MANY TO MANY A B a1 a3 a2 b4 b3 b2 b1 a4

16. TOTAL PARTICIPATION The participation of an entity set E in a relationship set R is said to be TOTAL if every entity in E participates in at least one relationship in R. Student A ENTITY SET : STUDENT Student B Student B Mr A Mr B Mr B ENTITY SET : TEACHER RELATIONSHIP SET : SUBJECT

17. PARTIAL PARTICIPATION Mr A ENTITY SET : DEPARTMENT Mr B Mr B PB204 P2113 BBC101 ENTITY SET : COURSES RELATIONSHIP SET : COURSE The participation an entity set E in a relationship set R is said to be PARTIAL if only some entities in E participate in relationships in R.

24. End Of Chapter 2