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Give two profit of Reuse of Code.
Reusing the implementation. Place existing class directly inside a new class. The new class can be made up of any number and type of the other objects, in any grouping that is needed to achieve desired functionality. This idea is called composition (or generally, aggregation). Composition is often termed as "has-a" relationship or "part-of" relationship, as in "automobile has an engine" or "engine is part of automobile."
Reusing the interface. Take an existing class and make modifications to achieve required functionality. This concept is known as inheritance. The original class is called Base class or Parent class and modified class is called the Derived or Inherited or Sub or Child class.
Question: This form represents one of a number used for each sailing of a range of boats. A passenger may go on many sailings and will have the same passenger number for each.
Define blocks? The database system resides eternally on non-volatile storage, and is into fixed-length storage units known as blocks.
File Organisation In Dbms Introduction Databases are used to store information. Usually, the principal operations we have to perform on database are those relating to:
Define rotational latency time. The time spent waiting for the sector to be accessed to appear under the head is known as the rotational latency time.
In object oriented design, which steps must designer take to adjust inheritance? To readjust inheritance following steps should be taken: i) Rearrange and adjust the classe
Write a query that display ename annual salary and comm from emp table
Failures and Recovery In practice various things might occur to prevent a transaction from completing. Recovery methods are used to bring database, which does not satisfy consi
Accessing information about permissions to all users- Object level permissions: With the use of data dictionary you can see the permissions to user. Let us get the table name fro
The clause in SQL which specifies that the query result should be sorted in ascending or descending order based upon the values of one or much more columns is Ans : Order by
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