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4

An entity set that does not have sufficient attributes to form a primary key is a

A. strong entity set.

B. weak entity set.

C. simple entity set.

D. primary entity set.

Correct Answer :

B. weak entity set.


Related Questions

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Which of the following aggregate function doesnt ignore NULLs in its results?

A. COUNT

B. COUNT(*)

C. MAX

D. none of these

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4

File organization that provides fast access to any arbitrary record

A. Hashed file

B. B-tree

C. Ordered file

D. Unordered file

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4

The privilege lists include
i) select
ii) insert
iii) update
iv) delete

A. only i)

B. only i) ii)

C. only i) ii) iii)

D. i) ii) iii) iv)

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4

The left outer join takes all tuples

A. in the left relation which didnt match with any tuple in right relation

B. in the left relation which matched with a tuple in right relation

C. in the right relation which didnt match with any tuple in left relation

D. in the right relation which matched with a tuple in left relation

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Commit operation …………… writes the changes made to the database.

A. temporarily

B. permanently

C. none of these

D. all of the above

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4

Transaction processing is associated with everything below except

A. producing detail, summary, or exception reports.

B. recording a business activity.

C. confirming an action or triggering a response.

D. maintaining data.

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4

A DBMS query language is designed to

A. support end users who use English-like commands.

B. support in the development of complex applications software.

C. specify the structure of a database.

D. all of the above.

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4

Count function in SQL returns the number of

A. values.

B. distinct values.

C. groups.

D. columns.

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4

The types of noiseless channels are
i) Selective Reject ARQ
ii) simplest protocol
iii) Go-Back-N ARQ
iv) Stop-and-Wait Protocol

A. i, ii only

B. ii and iv only

C. ii and iv only

D. i, iv only

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4

It is possible to define a schema completely using

A. VDL and DDL.

B. DDL and DML.

C. SDL and DDL.

D. VDL and DML.

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4

Encoding method which does not provide for synchronization

A. B8ZS

B. Manchester

C. RZ

D. NRZ-L

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4

A composite attribute is converted to individual attributes in which of the following normal form ?

A. first

B. Second

C. third

D. fourth

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4

FDDI protocol operates in
i) Transport layer
ii) Network layer
iii) Datalink layer
iv) Physical layer

A. i and ii only

B. ii and iii only

C. i and iii only

D. iii and iv only

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4

An entity set that does not have sufficient attributes to form a primary key is a

A. strong entity set.

B. weak entity set.

C. simple entity set.

D. primary entity set.

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4

Authorization command in SQL

A. Allow

B. Access

C. Grant

D. none of the above

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4

In a Hierarchical model records are organized as

A. Graph.

B. List.

C. Links.

D. Tree.

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4

Unwanted energy from source other than the transmitter.

A. Attenuation

B. Distortion

C. Delay

D. Noise

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4

Related fields in a database are grouped to form a

A. data file.

B. data record.

C. menu.

D. bank.

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4

The index table has …… Columns.

A. 1

B. 2

C. 3

D. 4

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4

In an Entity-Relationship Diagram Ellipses represents

A. Attributes

B. Weak entity set

C. Relationship sets

D. Multi-valued attributes

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4

For large networks, _______ topology is used

A. Ring

B. Bus

C. Mesh

D. none of these

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4

Which of the following is the unit of signaling speed or modulation rate or the rate of symbol transmission?

A. Data rate

B. Bit rate

C. Signal to Noise Ratio

D. Baud rate

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4

When all attributes in a relation tuple are not functionally dependent only on the key attribute. Which of the following normalization is needed?

A. first

B. second

C. third

D. fourth

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4

Every Boyce-Codd normal form is in

A. 3NF

B. 2NF

C. 1NF

D. none of the above

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4

The control of concurrent execution is left with the

A. operating system

B. controller unit of the kernel

C. concurrency control component of the database system

D. none

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4

The method of access which uses key transformation is known as

A. direct.

B. hash.

C. random.

D. sequential.

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4

Select the incorrect statement(s)
i) Shared locks are compatible with each other.
ii) A relation which is in 3NF may have redundancy due to composite keys.
iii) A table in a database can have multiple indexes.

A. i only

B. ii, only

C. ii, iii only

D. none of the above

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4

Noiseless channel has ……… types of protocols.

A. 2

B. 3

C. 4

D. 5

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4

Mail services are available to network users through the

A. Session layer

B. Presentation layer

C. Application layer

D. Transport layer

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In an E-R diagram attributes are represented by

A. rectangle.

B. square.

C. ellipse.

D. triangle.