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08 April, 2022

Second Normal Form (2NF)

 Programing Coderfunda     April 08, 2022     DBMS     No comments   

 

Second Normal Form (2NF)

  • In the 2NF, relational must be in 1NF.
  • In the second normal form, all non-key attributes are fully functional dependent on the primary key

Example: Let's assume, a school can store the data of teachers and the subjects they teach. In a school, a teacher can teach more than one subject.

TEACHER table

TEACHER_IDSUBJECTTEACHER_AGE
25Chemistry30
25Biology30
47English35
83Math38
83Computer38

In the given table, the non-prime attribute TEACHER_AGE is dependent on TEACHER_ID which is a proper subset of a candidate key. That's why it violates the rule for 2NF.

To convert the given table into 2NF, we decompose it into two tables:

TEACHER_DETAIL table:

TEACHER_IDTEACHER_AGE
2530
4735
8338

TEACHER_SUBJECT table:

TEACHER_IDSUBJECT
25Chemistry
25Biology
47English
83Math
83Computer

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