Define second normal form. What types of problems might you encounter using tables that are not in second normal form?

A Guide to SQL
9th Edition
ISBN:9781111527273
Author:Philip J. Pratt
Publisher:Philip J. Pratt
Chapter2: Database Design Fundamentals
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Define second normal form. What types of problems might you encounter using tables that are not in second normal form?

 

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Step 1

Database Normalization :

  • In database normalization data is represented in terms of relations that are in the standard normal form and it is a design technique that reduces data redundancy as well as eliminates undesirable characteristics.

 

1NF (First Normal Form) :        

  • The first Normal form is considered as a basic requirement of the database.

Rules :     

  •  Each table should contain a single value attributes or column.
  •  Each record in a table needs to be unique.

2NF(Second Normal Form) :

  • A table is in second normal form if and only if it is in first normal form and it should not have a partial dependency.

Rules :              

  •  A table in first normal form.
  •  it has a single-column primary key.
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