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Q:

What are PL/SQL cursor exceptions?

Answer

Cursor_Already_Open,  Invalid_Cursor.

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Subject: SQL

0 2295
Q:

What are constraints? Mention the different types of constraints?

Answer

Constraints enable the RDBMS to enforce the integrity of the database automatically, without the need to create triggers, rule or defaults.


Types of Constraints: NOT NULL, CHEQUE, UNIQUE, PRIMARY KEY, FOREIGN KEY.

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Subject: SQL

0 2294
Q:

What is the importance of Doctype in HTML?

Answer

Doctype tag is not a HTML tag, it is just an instruction that is passed to the web browser to check for the information that is being provided by the markup language in which the page is written. Doctype is sometimes referred as Document type definition (DTD) that describes some rules that has to be followed while writing the markup language so to make the web browser understand the language and the content correctly. Doctype is very important to be placed in the beginning of the HTML and before the <HTML> tag to allow easy rendering of the pages that are used.

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Subject: Web Technology

1 2292
Q:

Why we use array_flip

Answer

array_flip exchange the keys with their associated values in array ie. Keys becomes values and values becomes keys.

<?php
$arrayName    = array("course1"=>"php","course2"=>"html");
$new_array    = array_flip($arrayName);
print_r($new_array);
?>

OUTPUT :

Array
(
[php]     => course1
[html]    => course2
)

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Subject: PHP

0 2291
Q:

What are instance variables?

Answer Instance variables are those which are defined at the class level. Instance variables need not be initialized before using them as they are automatically initialized to their default values.
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Subject: Java

0 2290
Q:

What is a TCP Session?

Answer

the layer that establishes ,manages and terminates the session between two communticating devices

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Subject: Network Administration

0 2288
Q:

what is the use of virtual destructor in c++?

Answer

A destructor is automatically called when the object is destroyed. A virtual destructor in C++ is used primarily to prevent resource leaks by performing a clean-up of the object.

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Subject: C++

0 2285
Q:

What is the purpose of overriding toString() method?

Answer

we can override tostring() method to return String representation of our object data

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Subject: Java

0 2284