Why 4nf is better than bcnf

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What does the owner of a restaurant do. The purpose of report text. Defi ne fourth normal form. Explain why it is Questions Courses. Explain why it is more desirable than BCNF. Discuss join Discuss join dependencies and fi fth normal form with example. What is meant by denormalization? Why is it required? Jun 17 AM. Vikhyat B answered on June 19, Answer no.

To take database to the Third normal form, already the database must be achieved at first and second normal forms.

When the database is in 1NF and 2NF, there are no any duplicate columns and no any subsets of data that apply to multiple rows. Third normal form can be achieved by removing the columns of the tables, which are not fully, depend upon the primary key.

This normal form also known as the 3. To achieve BCNF, the database must be already achieved to third normal form. When following 1NF, the data redundancy increases since there will bemultiple columns with the same data in multiple rows. However, each row will be uniqueas a whole. It means that when a table has concatenated primary key, each columnin the table that is not part of the primary key must depend entirely upon theconcatenated key in order to exist.