Tell Me Something About Yourself - Interview Answers.

Try to introduce some of your most important employment-oriented skills as well as your education and accomplishments to the interviewer. Answer to this question is very important because it positions you for the rest of the interview. That's why this statement is often called the " Positioning Statement".

One should take the opportunity to show his/her communication skills by speaking clearly and concisely in an organized manner. Since there is no right or wrong answer for this question hence it is important to appear friendly.



YOUR ANSWERS CAN BE:

1) I am a person with strong interpersonal skills and have the ability to get along well with people. I enjoy challenges and looking for creative solutions to problems.

2) Besides the details given in my resume, I believe in character values, vision and action. I am quick in learning from mistakes. I am confident that the various tests that you have conducted will corroborate my competencies aptitude and right attitude for th…

Database/DBMS Interview Questions And Answers - Part XIV.


63) What Is Second (2nd) Normal Form (2NF)?

Answer: The purpose of second normal form (2NF) is to eliminate partial key dependencies. Each attribute in an entity must depend on the whole key, not just a part of it.

Definition: A relation Schema R is in 2NF if every non-prime attribute A in R is fully functionally dependent on the primary key of R.




64) What Is Third (3rd) Normal Form (3NF)?

Answer: Third Normal form also helps to eliminate redundant information by eliminating inter dependencies between non-key attributes. Before proceeding to 3NF, check that it is already in 2NF and there are no non-key attributes that depend on another non-key attribute.




65) What Is Boyce-Codd Normal Form (BCNF)? Also Define Multivalued Dependency?

Answer: A relation schema R is in Boyce-Codd Normal Form (BCNF) if whenever an FD X -> A holds in R, then X is a superkey of R.

Each normal form is strictly stronger than the previous one:
  • Every 2NF relation is in 1NF.
  • Every 3NF relation is in 2NF.
  • Every BCNF relation is in 3NF.
There exist relations that are in 3NF but not in BCNF. The goal is to have each relation in BCNF (or 3NF).


A multivalued dependency (MVD) X —>> Y specified on relation schema R, where X and Y are both subsets of R, specifies the following constraint on any relation state r of R: If two tuples t1 and t2 exist in r such that t1[X] = t2[X], then two tuples t3 and t4 should also exist in r with the following properties, where we use Z to denote

(R - (X ν Y)):
t3[X] = t4[X] = t1[X] = t2[X].
t3[Y] = t1[Y] and t4[Y] = t2[Y].
t3[Z] = t2[Z] and t4[Z] = t1[Z].

An MVD X —> Y in R is called a trivial MVD if (a) Y is a subset of X, or (b) X X —> Y = R.


ALSO CHECK THE BELOW FAQ's:

66) What is Fourth (4th) Normal Form (4NF)?
67) What is Fifth (5th) Normal Form (5NF)?
68) What Are The Lossless Inference Rules For Functional Dependencies (FD's) Or State The Armstrong's Axioms?
69) What Is Domain-Key Normal Form (DKNF)?
70) Define Transaction? Explain Different States Of Transaction?


71) Describe The ACID Properties Of A Transaction?
72) What Is Schedule & What Is The Importance Of Schedule?
73) What Do You Mean By Serializability In Transaction Processing?
74) What Are The Two Methods That Guarantee Serializability?
75) What Is Locking? What Are The Types Of Locking?

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