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# Technical Interview Questions and Answers :: iGate

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## Total Qs: 160+

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71 / 160

What is 2NF?
| | To Reading List | Asked In

A relation schema R is in 2NF if it is in 1NF and every non-prime attribute A in R is fully functionally dependent on primary key.

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What is 3NF?
| | To Reading List | Asked In

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.

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What is BCNF (Boyce-Codd Normal Form)?
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A relation schema R is in BCNF if it is in 3NF and satisfies an additional constraint that for every FD X -> A, X must be a candidate key.

74 / 160

What is 4NF?
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A relation schema R is said to be in 4NF if for every Multivalued dependency X ->-> Y that holds over R, one of following is true
> X is subset or equal to (or) XY = R.
> X is a super key.

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What is 5NF?
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A Relation schema R is said to be 5NF if for every join dependency {R1, R2, ..., Rn} that holds R, one the following is true
> Ri = R for some i.
> The join dependency is implied by the set of FD, over R in which the left side is key of R.

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What is Domain-Key Normal Form?
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A relation is said to be in DKNF if all constraints and dependencies that should hold on the constraint can be enforced by simply enforcing the domain constraint and key constraint on the relation.

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What is a query?
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A query with respect to DBMS relates to user commands that are used to interact with a database. The query language can be classified into data definition language and data manipulation language.

78 / 160

What is the difference between VARCHAR2 AND CHAR datatypes?
| | To Reading List | Asked In iGate

Char is a Fixed Length Variable and varchar is is a variable-length character data type.

79 / 160

Why SQL is preferred all over the world?
| | To Reading List | Asked In iGate

No Discussion on this question yet!

80 / 160

How will you rate your skills in C and C++?
| | To Reading List | Asked In iGate 