3i Infotech Papers: Sample Questions 948 - 949 of 1245

Examrace Placement Series prepares you for the toughest placement exams to top companies.

Question number: 948

» Languages » Java

Essay Question▾

Describe in Detail

What are normalization Rules? Define Normalization?

Explanation

Understanding the process of normalization

Understanding the Process of Normalization

Understanding the process of normalization

  • Normalization is process of organizing data in a database.

  • It organizes tables to reduce redundancy and dependency.

  • Redundant data wastes disk space and creates maintenance problems.

  • Data that exist in more than one place must be changed in same way in all locations.

  • For example, a customer address change is much easier to implement if that data is stored only in the customers table and nowhere else in the database.

Rules of database Normalization:

  • There are a few rules for database normalization.

  • Each rule is called a “normal form”.

  • If the first rule is observed, the database is said to be in “first normal form. ”

  • If the first three rules are observed, the database is considered to be in “third normal form. “

  • Among the levels of normalization, third normal form is the highest level necessary for most applications.

Question number: 949

» Languages » Java

Short Answer Question▾

Write in Short

What is the base class for all swing components?

Explanation

  • Swing components are derived from abstract javax. swing. Jcomponet class.

  • Which has following hierarchy:

java. lang. Object

java. awt. component

java. awt. container

javax. swing. jcomponent

It replaces selection of AWT GUI components.