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Normalization is the method of efficiently arranging data in a database. The main purpose of normalization is eliminate redundant data and data dependencies should be meaningful (related data should be stored in one table). To reduce insertion and deletion anomalies normalization is helpful.
With the following example we will see how normalization is helpful in reducing deletion and insertion anomalies
Table: Sales Orders (Un-normalized)
Sales Order No, Date , Customer No, Customer Name, Customer Address,
Clerk No, Clerk Name, item description, Quantity, Unit Price
Orginal Price : $29.90
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