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Q:

Difference between Candidate key and Primary key?

Answer

Candidate Key – A Candidate Key can be any column or a combination of columns that can qualify as unique key in database. There can be multiple Candidate Keys in one table. Each Candidate Key can qualify as Primary Key. 


Primary Key – A Primary Key is a column or a combination of columns that uniquely identify a record. Only one Candidate Key can be Primary Key.






        • One needs to be very careful in selecting the Primary Key as an incorrect selection can adversely impact the database architect and future normalization. For a Candidate Key to qualify as a Primary Key, it should be Non-NULL and unique in any domain.




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Subject: Oracle Certification
Job Role: Software Architect , Project Manager , Network Engineer , IT Trainer , Database Administration , Analyst

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Q:

What is the official language of African Export and import Bank

A) Egypt B) Senegal
C) Dauber D) None of these
 
Answer & Explanation Answer: A) Egypt

Explanation:
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Filed Under: World Organisations

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Q:

The pair of spinal nerves in main are

A) 30 B) 31
C) 32 D) 33
 
Answer & Explanation Answer: B) 31

Explanation:
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Filed Under: Biology

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Q:

' Ashoka Chakra ' is awarded for 

A) Outstanding contribution to literature B) Gallantry by children
C) Acts of gallantry in the presence of the enemy D) Acts most conspicuous bravery of self saccrifice on land, air or sea but not in the presence of the enemy
 
Answer & Explanation Answer: D) Acts most conspicuous bravery of self saccrifice on land, air or sea but not in the presence of the enemy

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Filed Under: Honours and Awards

3 4195
Q:

Solids have definite shapes.This is because

A) the forces of cohesion of the molecules within are very much less in them B) the forces of cohesion are very large
C) the forces of adhesion are large D) the forces of adhesion are less
 
Answer & Explanation Answer: B) the forces of cohesion are very large

Explanation:

Cohesion refers to attraction between molecules of the same kind while adhesion refers to attraction between different kinds of molecules

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Filed Under: Physics

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Q:

evtlesnioi-Arrange this word

A) Elevision B) Television
C) Senivion D) Telsion
 
Answer & Explanation Answer: B) Television

Explanation:
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Filed Under: English
Exam Prep: AIEEE , Bank Exams , CAT , GATE , GRE
Job Role: Analyst , Bank Clerk , Bank PO

5 4194
Q:

The Most Important Ore of Aluminium is

A) Calamine B) Monazite
C) Magnetite D) Bauxite
 
Answer & Explanation Answer: D) Bauxite

Explanation:
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Filed Under: Chemistry
Exam Prep: AIEEE , Bank Exams , GATE
Job Role: Analyst , Bank PO

9 4193
Q:

Which is smallest state by area of India ?

Answer

Goa

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Subject: Longest, Shortest, Deepest

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