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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

12 2550
Q:

In a certain code language, "PUNISHED" is written as "288" and "TAILOR" is written as "225". How is "RELEASED" written in that code language?

A) 207 B) 237
C) 225 D) 243
 
Answer & Explanation Answer: A) 207

Explanation:
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Filed Under: English
Exam Prep: Bank Exams

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Q:

Explain Given the following SQL statement: GRANT REFERENCES ON TABLE tab1 TO USER usera.Which of the following describes what USERA is allowed to do?

A) Create a read?only view using TAB1. B) Alter TAB1 to add a check constraint.
C) Define a primary key or unique constraint on TAB1. D) Define a dependent table where TAB1 is the parent.
 
Answer & Explanation Answer: D) Define a dependent table where TAB1 is the parent.

Explanation:
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Filed Under: IBM Certification

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Q:

Instrument for measuring work performed is called _________.

A) Eudiometer B) Anemometer
C) Hyetometer D) Ergometer
 
Answer & Explanation Answer: D) Ergometer

Explanation:
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Filed Under: Physics
Exam Prep: Bank Exams

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Q:

On the PC side the printer port is a

A) 25 pin female parallel connector B) 25 pin female serial connector
C) 15 pin female parallel connector D) 25 pin male serial connector
 
Answer & Explanation Answer: A) 25 pin female parallel connector

Explanation:

Screenshot_(66)1593757209.jpg image

 

On the PC side the printer port is a 25 pin female parallel connector.

 

 

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Filed Under: Computer
Exam Prep: Bank Exams

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Q:

Production costs to an economist

A) reflect opportunity costs B) consist only of explicit costs
C) always reflect monetary outlays D) never reflect monetary outlays
 
Answer & Explanation Answer: A) reflect opportunity costs

Explanation:

Production costs to an economist reflect opportunity costs.

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Filed Under: Indian Economy
Exam Prep: AIEEE , Bank Exams , CAT
Job Role: Analyst , Bank Clerk , Bank PO

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Q:

Who was the last Emperor of Rome ?

A) Nero B) Ceaser
C) Romulus Augustulus D) Julius
 
Answer & Explanation Answer: C) Romulus Augustulus

Explanation:
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Filed Under: World History

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Q:

The mean distance of the earth from the sun is approximately

A) 149,502,000 km B) 150,503,000 km
C) 148,000,000 km D) 150,000,000 km
 
Answer & Explanation Answer: A) 149,502,000 km

Explanation:
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Filed Under: World Geography

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