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Most of the universities are nowadays incorporating new subjects and features in academic education to provide detail information regarding various technologies by assigning them different tasks. From that, all subjects database is also one of such subjects in which students face many t complexities while developing the assignments which are assigned to them. But it is the time when students must not worry regarding the database assignments which are assigned to them. As our experts have specialisation in this particular area and guide students step by step to develop the assignment according to the instructions which are provided to them.

Normalization

Normalization is referred to as the process of removal of data redundancy and data integrity from the table by eliminating all the repeating groups that exist in the particular table. Normalization is categorised into three types which are:

  • First Normal  Form
  • Second Normal Form
  • Third Normal Form

Format which is to be followed while formation of Normalization assignment

Step 1: Definition of Normalization

Step 2: Basic concepts of Normalization such as:

  • Partial Dependency
  • Transitive Dependency
  • Second Normal Form
  • First Normal Form
  • Third Normal Form
  • Anomalies

Step 3: 1st Normal Form

Step 4: 2nd Normal Form

Step 5: 3rd Normal Form

Step 6: Normalised Table

Step 7: Relational Schema

Step 8: References

 

An example which is illustrated below will help in stating the procedure through which one can easily get to know about the process that will be helpful in developing normalisation assignment which t is t assigned.

Un-Normalized Table

The un-normalised table is the table in which data redundancy and data integrity exist. The table with all repeating group of elements is also termed as a un-normalised table. The below given table is an example of a un-normalised table.

Prod_code

Prod_Name

Purchase_date

Qty_sold

Prod_price

Inv_No

Inv_Date

Vendor_ID

Vendor_Name

ES12345

Esky Soft Cooler

12/7/2016

60

19.50

B-5565

17/7/2016

112

Innisfail

MAK2347

Angle Grinder

15/9/2016

10

85

B-5570

18/9/2016

106

RC Tools

KAR62705

High Pressure Cleaner

13/10/2016

50

190

B-5572

18/9/2016

103

Ardonly

AEC25874

Circular Saw

15/9/2016

15

119

B-5570

18/9/2016

106

RC Tools

ES2396

Water filter

20/8/2016

45

26.50

B-5585

25/8/2016

112

Innisfail

 

Now convert the above given table in the 1st Normal form.

1st normal Form

  • To convert table in 1st normal form various  steps are to be performed which  are  as:
    Firstly assign primary key
  • Secondly, remove all the repeating  group of elements

Primary key :-> Vendor_Id

1st Table: Vendor_detail

Vendor_Id

Vendor_Name

2nd Table: data_products

Prod_Code

Prod_Name

Prurchase_Date

Qty_Sold

Prod_Price

Inv_No

Inv_Date

Vendor_Id

 

2nd Normal Form

 In second normal form various steps are performed which are as:

  • Firstly check whether the table is in 1st Normal form.
  • Secondly, Remove the partial dependency which exists in the table.

 

Primary Key:-> Prod_Code+ Vendor_Id

3rd Table: Products_data

Prod_code

Prod_name

Prod_Price

 

4th Table

Prod_Code

Prurchase_Date

Qty_Sold

Inv_No

Inv_Date

Vendor_Id

 

3rd Normal Form

In  third normal form various  steps  will  be practised which are :

  • Firstly check whether the table is in second normal form.
  • Secondly, remove transitive dependency which exists in the table.

 

5th Table: Product_Invoice

Prod_Code

Qty_Sold

Inv_No

 

6th Table: Inv_details

Inv_No

Purchase_Date

Inv_date

 

Note:
 After completing this entire separate all the normalised tables which are formed.

Normalised Tables

  1. Vendor_detail

Vendor_Id

Vendor_Name

 

  1. Products_data

Prod_code

Prod_name

Prod_Price

 

  1. Product_Invoice

Prod_Code

Qty_Sold

Inv_No

 

  1. Inv_details

Inv_No

Purchase_Date

Inv_date

 

Relational Schema

Relational Schema is a blueprint which helps in stating that how the database is constructed.

  1. Vendor_detail (Vendor_ID, Vendor_Name)

Primary Key(Vendor_ID)

  1. Products_data(Prod_code, Prod_name, Prod_Price)

Primary Key(Prod_code)

  1. Product_Invoice(Prod_Code, Qty_Sold, Inv_No)

Primary Key(Prod_Code, Inv_No)

Foreign Key(Prod_Code) references  Products_data (Prod_Code)

Foreign Key(Inv_No) references Inv_details (Inv_No)

  1. Inv_details(Inv_No, Purchase_Date, Inv_date)

Primary key (Inv_no)

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