Technology Questions

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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Q:

What is a Trigger? Explain Types of PL/SQL Triggers.

Answer

A database trigger is procedural code that is automatically executed in response to certain events on a particular table or view in a database. The trigger is mostly used for maintaining the integrity of the information on the database.


Syntax:


CREATE OR REPLACE TRIGGER [Trigger Name] [Before / After / Instead Of]


ON [schema].[table]


<PL/SQL subprogram>


 


Types of PL/SQL triggers : 


> Row trigger          - The trigger fires for each ROW affected.


> Statement trigger - The trigger is fired once when the condition is matched


> Before and After trigger - The BEFORE trigger run the trigger action before the insert, update or delete statement. The AFTER trigger runs the trigger action after the insert, update or delete statement is executes.

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Subject: Oracle

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Q:

What is the difference between creating String as new() and literal ?

Answer

When we create string with new() Operator, it’s created in heap and not added into string pool while String created using literal are created in String pool itself which exists in PermGen area of heap.



String s = new String("Test");

does not put the object in String pool , we need to call String.intern() method which is used to put them into String pool explicitly. its only when you create String object as String literal e.g. String s = "Test" Java automatically put that into String pool.

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Q:

Why is the main() method declared static?

Answer

main() method is called by the JVM even before the instantiation of the class, hence it is declared as static.

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Subject: Java

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Q:

What is the return type of the main() method?

Answer Main() method doesn't return anything hence declared void.
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Subject: Java

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Q:

How to read and write a file using javascript?

Answer

I/O operations like reading or writing a file is not possible with client-side javascript. However , this can be done by coding a Java applet that reads files for the script. 

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Subject: Web Technology

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Q:

What is CICS?

Answer

Customer Information Control System (CICS) is an online transaction processing monitor from IBM that acts as an interface between the operating system and application programs to provide rapid high-volume online transaction processing.

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Q:

What are Child Selectors ?

Answer

A child selector is used when you want to match an element that is the child of another specific element.
The parent and child selectors are separated by spaces.
The following selector locates an unordered list element within a paragraph element and makes a text within that element bold.


p > ul {font-weight: bold;}

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Subject: Web Technology

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