3i Infotech Placement: Sample Questions 537 - 538 of 1245

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Question 537


Describe in Detail


What is a class?


Understanding of Different Level, Class and Files
  • Class is an object oriented programming concept.
  • Provides user defined data type, which holds data members and member functions.
  • It can accessed and used by creating an instance of that class.
  • A class is like blueprint for an object.
  • For example, consider the class of cars.
  • There may be many cars with different names and brand but all of them will shared common properties like 4 wheels, speed limit, mileage range etc.
  • The member functions determine the behaviour of the class- support operations on data held in the objects of the class.

Definition of a class:

Class class_name


Data Member;



Class member:

Data and functions are members.

Question 538



Which of the following is TRUE for the ENFORCE KEY field

  1. ENFORCE KEY field characteristic indicates the source of the value that SQL ⚹ FORMS uses to populate the field
  2. A field with the ENFORCE KEY characteristic should have the INPUT ALLOWED characteristics turned off


Choice (4)


Only 2 is TRUE


Only 1 is TRUE


1 and 2 are FALSE


1 and 2 are TRUE




Define Enforcing Key Constrain


  • Is a way to enforce integrity within our oracle database.
  • It a constraint used to enforce a relationship between two tables- the values in the one table must appear in another table.
  • Can be defined in either a CREATE TABLE statement or an ALTER TABLE statement.
  • Indicates the source of the value that SQL ⚹ FORMS uses to populate the field.
  • Field in one table refers to the PRIMARY KEY in another table.
  • Relationships involve a parent table that holds the central data values and a child table with identical values pointing back to its parent.
  • The parent and child tables must use the same storage engine.
  • They must not be temporary tables.

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