Q:

What is Primary Key in DBMS?

Answer

A primary key is a special relational database table column or combination of columns designated to uniquely identify all table records. That is, A primary key is a column or set of columns in a table that uniquely identifies tuples (rows) in that table.

A primary key, also called a Primary Keyword.

Main Features Primary key are ::

It must contain a unique value for each row of data.

It cannot contain null values.

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Subject: Oracle Certification
Job Role: Database Administration , IT Trainer , Software Architect

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Q:

Father of Email

Email1498884677.jpg image

A) A	B) B
C) C	D) D

Answer & Explanation Answer: B) B

Explanation:

Ray Tomilson

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Job Role: Bank PO , Bank Clerk

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Q:

Waksman got the noble prize for the discovery of

A) Streptomycin	B) Chloromycetin
C) Pencillin	D) Neomycin

Answer & Explanation Answer: A) Streptomycin

Explanation:

In 1952, Waksman was awarded the Nobel Prize in Physiology or Medicine in recognition "for his discovery of streptomycin," the first antibiotic active against tuberculosis.

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Job Role: Analyst , Bank Clerk , Bank PO

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Q:

What would be the output of the following program?

main()

{

char ch ='A';

printf ("%d%d", sizeof (ch), sizeof ('A'));

}

Answer

1 2

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Subject: Programming

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Q:

Which of the following can be kept in memory when the DB2 configuration parameter KEEPFENCED is enabled?

A) SQLDAS after their cursor is closed.	B) Referential integrity maps after a join.
C) Stored procedure processes after they are run.	D) Tables after they have been read into the buffer pool.

Answer & Explanation Answer: C) Stored procedure processes after they are run.

Explanation:

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Filed Under: IBM Certification

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Q:

Improve the bracketed part of the sentence.
Bull markets, John Templeton said, are born on pessimism, grow on scepticism, mature on optimism and (die for) euphoria.

A) die on	B) die at
C) die above	D) No improvement

Answer & Explanation Answer: A) die on

Explanation:

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Q:

Which is the weakest force in the universe?

Answer

Gravitational Force

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Subject: Physics

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Q:

Which country has recorded second highest COVID19 death toll in world after China?

A) Italy	B) Iran
C) India	D) Japan

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