2. “
⊷ Group Members
2
1. P.P.P.Madhushani
2. G.G.A.R.U.Gunasekara
3. N.H.B.Pethiyagoda
4. Ayesha Vidyani
3. Normalization
⊷ Database Normalization is a technique of organizing
the data in the database. Normalization is a systematic
approach of decomposing tables to eliminate data
redundancy(repetition) and undesirable characteristics
like Insertion, Update and Deletion Anamolies. It is a
multi-step process that puts data into tabular form,
removing duplicated data from the relation tables.
Normalization is used for mainly two purposes,
⊷ Eliminating redundant (useless) data.
⊷ Ensuring data dependencies make sense i.e. data is
logically stored.
3
4. “
Data Redundancy occurs when the same data is entered
in to two or more fields of a database.
4
Difference Between Duplication and Redundancy
Data Duplication occurs when an exact copy of a
piece of data is created.
12. Second Normal Form
12
A table is in the second normal
form AND no column that is not
part of the primary key is
dependant only a portion of the
Primary Key.
15. Third Normal Form
15
A table is in the third normal
form if it is in the second
normal form. And there are
no non-key columns
dependant on other non-key
columns that could not act
as the primary key.