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If a table is in Third Normal Form (3NF), which of the following must be true?Group of answer choicesAll attributes are functionally dependent on the primary keyIt is in 1NF and 2NFIt has no transitive dependenciesAll the Available Optio

Question

If a table is in Third Normal Form (3NF), which of the following must be true?Group of answer choicesAll attributes are functionally dependent on the primary keyIt is in 1NF and 2NFIt has no transitive dependenciesAll the Available Optio

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Solution

If a table is in Third Normal Form (3NF), the following must be true:

  1. All attributes are functionally dependent on the primary key: This means that each non-primary key attribute must be functionally dependent on the primary key. In other words, the value of each non-primary key attribute is determined by the value of the primary key.

  2. It is in 1NF and 2NF: Before a table can be in 3NF, it must first meet the requirements of 1NF and 2NF. 1NF requires that the table has a primary key and that its attributes are atomic (cannot be broken down further). 2NF requires that it is in 1NF and that all non-key attributes are fully functionally dependent on the primary key.

  3. It has no transitive dependencies: A transitive dependency occurs when a non-key attribute is functionally dependent on another non-key attribute. In 3NF, this is not allowed. All non-key attributes must be directly dependent on the primary key.

So, all the available options must be true for a table to be in Third Normal Form (3NF).

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Similar Questions

When is a relation considered to be in second normal form (2NF)? (Select the best answer.)Select one:a.When there are no repeating groups in a relationb.When there are no transitive functional dependenciesc.When there are no dependencies on part of the primary keyd.When there are no dependent attributes in transitive relation

What is TRUE about the Third Normal Form (3NF)?a.All of the answerb.Data duplication is reduced by using 3NFc.When a relation is in 2NF and does not contain transitive partial dependencies, it will be in 3NFd.It helps maintain the integrity of the data

Which of the following normal forms is achieved when all non-key attributes are fully functionally dependent on the primary key?Question 11Answera.Second Normal Form (2NF)b.Boyce-Codd Normal Form (BCNF)c.First Normal Form (1NF)d.Third Normal Form (3NF)

Choose the correct answerWhich one of the following statements about normal forms is FALSE?OptionsLossless, dependency–preserving decomposition into BCNF is always possibleLossless, dependency-preserving decomposition into 3 NF is always possibleBCNF is stricter than 3 NFAny relation with two attributes is BCNF

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