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Use Delegation to Share Implementation
The delegation "Delegation comprises of catching an operation on one object and sending it to other object which is part, or related to first object. In this method, only meaningful operations are delegated to second object, and meaningless operations can be banned from being inherited accidentally".
It is actuality that inheritance is an event for implementing generalization, in which behaviour of super class is shared by all of its subclasses. But, sharing of behaviour is justifiable only when a true generalization relationship come across, that is, only when it can be said which subclass is a form of the super class.
What is Management System? A management system is a set of rules and process which help us to create organize and manipulate the database. It also helps us to add, change delet
Differentiate between a unique key and a primary key. - By default, clustered index on column are created by primary key while nonclustered index are created by unique key.
a publishing company produce scientific books on various subjects. the books are written by authors who specialize in one particular subject. the company employs editors who, not n
Improved performance: As the data is located near the site of its demand, and given the inherent parallelism because of multiple copies, speed of database access may be good for di
What is a relationship called when it is maintained between two entities? A relationship is called Binary relationship when it is maintained between two entities.
What is view in SQL? How is it defined? Any relation that is not part of the logical model, but is made visible to a user as a virtual relation is known as a view. We descri
We have a new website where I need someone to 1: Inhabit the back end with all the recruitment agencies in the UK. I require someone who is not manually going to do this, but who w
Consider the following relational schema: PERSON (SS#, NAME, ADDRESS) CAR (REGISTRATION_NUMBER, YEAR, MODEL) ACCIDENT (DATE, DRIVER, CAR_REG_NO) OWNS (SS#, LICENSE) Constru
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let us consider a table having 2200 records and the fixed size of the table to be considered as 25.then how many numbers of table is requredto perform horizontal fragmentation
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