Technical Interview Questions and Answers :: iGate
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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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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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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.
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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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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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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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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.
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Char is a Fixed Length Variable and varchar is is a variable-length character data type.
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