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4

The set of all values that can be taken by the attribute is called as _______ of the attribute.

A. Tuple

B. Cardinality

C. Degree

D. Domain

Correct Answer :

D. Domain


Related Questions

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4

The one guideline to be followed while designing the database is

A. A database design may be ambiguous.

B. It should avoid/reduce the redundancy.

C. Unrelated data should be in the same table so that updating the data will be easy.

D. An entity should not have attributes.

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4

operator is used to compare a value to a list of literals values that have been specified.

A. Like

B. COMPARE

C. BETWEEN

D. IN

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4

Assume transaction A holds a shared lock R. If transaction B also requests for a shared lock on R.

A. It will result in a deadlock situation.

B. It will immediately be rejected.

C. It will immediately be granted.

D. It will be granted as soon as it is released by A .

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4

Which of the following is not a logical database structure?

A. Chain

B. Network

C. Tree

D. Relational

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4

DROP is a statement in SQL.

A. Query

B. Embedded SQL

C. DDL

D. DCL

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Which one is true statement :

A. With finer degree of granularity of locking a high degree of concurrency is possible.

B. Locking prevents non-serializable schedules.

C. Locking cannot take place at field level.

D. An exclusive lock on data item X is granted even if a shared lock is already held on X.

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4

The fact that all employees of a particular organization should not have salaries more than $10000 is a _____ constraint.

A. Schema

B. Tuple

C. Domain

D. Relational

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4

For using a specific database …………… command is used.

A. use database

B. database name use

C. Both A & B

D. None of them

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4

Data independence means

A. data is defined separately and not included in programs.

B. programs are not dependent on the physical attributes of data

C. programs are not dependent on the logical attributes of data

D. both B and C

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4

____ table store information about database or about the system.

A. SQL

B. System

C. Nested

D. None of these

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4

What are the desirable properties of a decomposition

A. Partition constraint.

B. Dependency preservation.

C. Redundancy.

D. Security.

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4

_____ First proposed the process of normalization.

A. Edgar. W

B. Edward Stephen

C. Edgar F. Codd

D. Edward Codd

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4

SQL server stores index information in the _____system table

A. system indexes

B. syst indexes

C. sys indexes

D. sysind

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Data items grouped together for storage purposes are called a

A. record

B. string

C. title

D. list

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A _____ is used to define overall design of the database

A. code

B. data definition language

C. application program

D. schema

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4

Consider the join of relation R with a relation S. If R has m tuples and S has n tuples, then the maximum and minimum size of the join respectively are

A. m+n and 0

B. m+n and |m-n|

C. mn and 0

D. mn and m+n

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4

In an E-R, Y is the dominant entity and X is a subordinate entity. Then which of the following is incorrect :

A. Operationally, if Y is deleted, so is X

B. existence is dependent on Y.

C. Operationally, if X is deleted, so is Y.

D. Operationally, if X is deleted, & remains the same.

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4

_____ command can be used to modify a column in a table

A. alter

B. update

C. set

D. create

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4

Which of the following is a reason to model data?

A. Understand each user's perspective of data

B. Understand the data itself irrespective of the physical representation

C. Understand the use of data across application areas

D. All of the above

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4

The keyword to eliminate duplicate rows from the query result in SQL is

A. DISTINCT

B. NO DUPLICATE

C. UNIQUE

D. None of the above

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4

Use of UNIQUE while defining an attribute of a table in SQL means that the attribute values are

A. distinct values

B. cannot have NULL

C. both (A) & (B)

D. same as primary key

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4

………………… approach reduces time and effort required for design and lesser risk in database management.

A. Single global database

B. Multiple databases

C. Top-down approach

D. None of the above

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4

Which is the best file organization when data is frequently added or deleted from a file?

A. Sequential

B. Direct

C. Index sequential

D. None of the above

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4

In SQL, testing whether a subquery is empty is done using

A. DISTINCT

B. UNIQUE

C. NULL

D. EXISTS

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4

A transaction is in state after the final statement has been executed.

A. partially committed

B. active

C. committed

D. none of the above

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4

For correct behaviour during recovery, undo and redo operation must be

A. Commutative

B. Associative

C. idempotent

D. distributive

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4

A relation is in attribute of other composite key. if an attribute of a composite key is dependent on an

A. 2NF

B. 3NF

C. BCNF

D. 1NF

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4

What will be the number of columns and rows respectively obtained for the operation, A- B, if A B are Base union compatible and all the rows of a are common to B? Assume A has 4 columns and 10 rows; and B has 4 columns and 15 rows

A. 4,0

B. 0,0

C. 4,5

D. 8,5

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4

Protection of data from unauthorized Disclosure results in loss of _______

A. Integrity

B. Availability

C. Confidentiality

D. Discretionary Security

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4

Dependency preservation is not guaranteed in

A. BCNF

B. 3NF

C. PJNF

D. DKNF