Interview Questions

Q:

What is mesh network?

Answer

A network in which there are multiple network links between computers to provide multiple paths for data to travel.

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Subject: Network Administration
Job Role: IT Trainer

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Q:

Difference between a query and a statement in SQL?

Answer

An SQL statement is a string of characters that conforms to the syntax and format specified in the international standard.


A query is a statement that returns a record-set.

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Subject: SQL

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Q:

Can you work in shifts?

Answer

Say “Yes” if you have made up your mind to work for a call center. Call centers would usually work 24 X 7 which needs some executives to be always present in the center. This means that you would need to work in shifts. 

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Subject: Call Center

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Q:

What are the basic concepts of object oriented programming?

Answer

It is necessary to understand some of the concepts used extensively in object oriented programming.These include


Objects
Classes
Data abstraction and encapsulation
Inheritance
Polymorphism
Dynamic Binding
Message passing

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Subject: C++

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Q:

What is the difference between primary key & unique index ?

Answer

Primary key : a relational database constraint. Primary key consists of one or more columns that uniquely identify a row in the table. For a normalized relation, there is one designated primary key.


Unique index: a physical object that stores only unique values. There can be one or more unique indexes on a table.

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Q:

What is the difference between UNION and UNION ALL?

Answer

UNION selects only distinct values whereas UNION ALL selects all values and not just distinct ones

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Subject: SQL

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Q:

Define and explain COM?

Answer

COM is the component Object Model is a system whch creates application which are binary form that is language independent , object oriented ,modular and reusable .

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Q:

What is PHP?

Answer

PHP: Hypertext Preprocessor is open source server-side scripting language that is widely used for web development. PHP scripts are executed on the server. PHP allows writing dynamically generated web pages efficiently and quickly. The syntax is mostly borrowed from C, Java and perl. PHP is free to download and use.


 

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Subject: PHP

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