INTERVIEW QUESTIONS DATABASE RELATIONAL DATABASE DETAILS

Question: What is 3NF?

Answer: A relation schema R is in 3NF if it is in 2NF and for every FD X --> A either of the following is true

► X is a Super-key of R.
► A is a prime attribute of R.

In other words, if every non prime attribute is non-transitively dependent on primary key.

A relation schema R is in 3NF if it is in 2NF and for every FD X --> A either of the following is true

► X is a Super-key of R.
► A is a prime attribute of R.

In other words, if every non prime attribute is non-transitively dependent on primary key. Source: CoolInterview.com

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