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Que. Which level of Abstraction describes how data are stored in the data base ? 
a. Physical level
b. View level
c. Abstraction level
d. Logical level
Answer:Physical level
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Consider the following statements regarding relational database model:

(a) NULL values can be used to opt a tuple out of enforcement of a foreign key.
(b) Suppose that table T has only one candidate key. If Q is in 3NF, then it is also in BCNF.
(c) The difference between the project operator (P) in relational algebra and the SELECT keyword in SQL is that if the resulting table/set has more than one occurrences of the same tuple, then P will return only one of them, while SQL SELECT will return all.

One can determine that:
A locked file can be:
Suppose R is a relation schema and F is a set of functional dependencies on R. Further, suppose R1 and R2 form a decomposition of R. Then the decomposition is a lossless join decomposition of R provided that:
Which of the following is true?

I.  Implementation of self-join is possible in SQL with table alias.

II. Outer-join operation is basic operation in relational algebra.

III. Natural join and outer join operations are equivalent.
SQL command to delete a column from an existing table:
Division operation is ideally suited to handle queries of the type :
Which of the following statements is FALSE about weak entity set ?
A primary key for an entity is:
Which of the following statements regarding the features of the object-oriented approach to databases are true ?

(a) The ability to develop more realistic models of the real world.
(b) The ability to represent the world in a non-geometric way.
(c) The ability to develop databases using natural language approaches.
(d) The need to split objects into their component parts.
(e) The ability to develop database models based on location rather than state and behaviour.
A clustering index is defined on the fields which are of type:
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