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Interview Questions and Answers for 'Paypal' - 3 question(s) found - Order By Newest

Frequently asked in Cognizant ( Based on 2 feedback )
  Q1. What are Inner , Outer , Left and Right Joins in SQL ?Database2017-01-09 13:07:55

Ans. Inner join is the intersection of two tables on the condition defined by the where clause i.e will get records from both tables matched by a column.

Outer join is the union of two tables i.e will get all records from both tables and will put null in the columns where related records are not present.

Left Outer join is the left union of two tables i.e all records from the table on the left and values from the right table for related records else null for the columns from right table.

Right Outer join is the right union of two tables i.e all records from the table on the right and values from the left table for related records else null for the columns from left table.

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Related Questions

 What is a self Join and give an example of a self Join ?

or

What is self Join and What is it's purpose ?
  Difference between Inner and Outer Join ?
 If Table A has 100 records and Table B has 50 records , how many records will the left join of Table A with Table B generate ?
 If Table A has 100 records and Table B has 50 records , how many records will the right join of Table A with Table B generate ?
 If Table A has 0 records and Table B has 50 records , how many records will the equi join of Table generate ?
 What is Left Outer Join ?
 Describe SQL Joins


  Q2. Difference between SAX and DOM Parser ?Xml
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Ans. A DOM (Document Object Model) parser creates a tree structure in memory from an input document whereas A SAX (Simple API for XML) parser does not create any internal structure.

A SAX parser serves the client application always only with pieces of the document at any given time whereas A DOM parser always serves the client application with the entire document no matter how much is actually needed by the client.

A SAX parser, however, is much more space efficient in case of a big input document whereas DOM parser is rich in functionality.

Use a DOM Parser if you need to refer to different document areas before giving back the information. Use SAX is you just need unrelated nuclear information from different areas.

Xerces, Crimson are SAX Parsers whereas XercesDOM, SunDOM, OracleDOM are DOM parsers.

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Related Questions

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  What is unmarshalling ?
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 Q3. Why main method is declared static ?Core Java2017-01-09 18:35:30

Ans. static is the keyword that makes it accessible even without creating any object and using class name only. Making it non static would like creation of object upfront before calling the method.

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Related Questions

  Why do we write public static void main ? Can we use some other syntax too for main ?
 Which of the following is false about main method ?

a. It should be declared public and static
b. it should have only 1 argument of type String array
c. We can override main method
d. We can overload main method
 Can we have multiple main methods in a single class ?
  Can we overload main method in Java ?
  What will happen if static modifier is removed from the signature of the main method?
  How can we execute a Java class independently if it doesn't have a static main method ?
 Can we declare a main method as abstract ?
 Do all java classes need a main method?
 Can we declare the main method as private ?




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