The document discusses database normalization. It defines several normal forms including 1NF, 2NF, 3NF, BCNF, 4NF and 5NF. For each normal form, it provides a brief definition and explains how the current normal form builds upon the previous one by further restricting dependencies between attributes in a database table. The goal of normalization is to eliminate redundant or anomalous data and optimize database structure.

1. Nittaya Wongyai

2. Normalization
 Normalization
Normal Form 3
 1 1NF
 2 2NF E.F.Codd
 3 3NF
 Boyce/Codd Normal Form BCNF
 4 4NF
Fagin
 5 5NF

3. Normalization



4. ER-to-Relational Mapping Algorithm
Strong Entity
(PK)
P1101 6 990
P1102 199

5. ER-to-Relational Mapping Algorithm
PK
J1101 2554 Weak Entity
J1102 2554
FK)
J1101
J1102

6. PK
550987786
Associative
550987787 Entity
(FK) (FK)
550987786 LSIT1111 89 A
550987787 LSIT1113 49 F
PK
LSIT1111
LSIT1113

8. The Process of Normalization:
First Normal Form 1NF

 1NF
Atomic 1
Repeating groups

9. The Process of Normalization: First Normal Form
1NF

10. The Process of Normalization:
Second Normal Form 2NF

 2NF
1NF

(Primary key)
Composite key
 Partial Dependency

11. The Process of Normalization: Second Normal Form
2NF
1NF
2NF

12. 2 NF

13. The Process of Normalization:
Third Normal Form 3NF

 3NF
2NF
 Transitive Dependency

14. The Process of Normalization: Third Normal Form
3NF
2NF
3NF

15. Boyce-Codd Normal Form(BCNF)

 (Candidate key) 2


17. BCNF

18. The Process of Normalization: Fourth Normal Form
4NF

 BCNF
 Multivalued Dependencies (MVDs)
 3
 2

19. BCNF 4NF

20. BCNF
4NF

21. The Process of Normalization: Fifth Normal Form
5NF

 4NF
 Join Dependency

22. 5 NF

23. 5 NF