美国代写论文：关系数据库

美国代写论文：关系数据库

随着我们的社会在不断增长的发展中，越来越多的文件正在以电子方式创建，传输和存储。有两种流行的数据库，它们是面向对象和对象关系数据库。大约百分之八十八的组织使用关系数据库，另一方面面向对象的数据库被百分之五十五的组织收购用于未来的计划。必须明确理解两种数据库技术的好处，才能做出选择任何一种数据库来处理公司真实问题的决策。

美国代写论文：关系数据库
技术在对象关系数据库和面向对象的数据库中：
特征：
继承：开发者被允许继承，以获取具有相似属性和方法的对象，然后抽象出相似之处。然后，子类从超类继承而来。超类的实例由子类的实例组成，子类的属性与超类的属性类似。继承是单一的，多重的，联合的，互斥的，部分的，重复的和选择性的继承。单继承和多继承被主继承使用。如果继承只有一个超级类，那么这就是所谓的单一继承。另一方面，当子类从多个超类继承时，它被称为多重继承。

美国代写论文：关系数据库

As our society is developing at an increasing rate larger files are being created, transmitted and stored electronically. There are two popular kinds of databases and these are object-oriented and object-relational databases. About eighty-eight percent of organizations use relational databases and on the other hand the object oriented databases are acquired by fifty-five percent of the organization for their future plans. The benefits of technology of two kinds of databases must be understood clearly so that decisions can be taken for choosing any one kind of databases for dealing with the real problem of the company.

美国代写论文：关系数据库
Technology in object-relational database and in object-oriented database:
Features:
Inheritance: The developers are allowed in inheritance for taking the objects having similar attributes and methods and then similarities are abstracted out of them. Then the subclasses are created inherited from a super -class. The instances of the super-class are composed of the instances of the subclasses and the properties of subclass are similar to the properties of the super-class. The inheritances are of various types such as single, multiple, union, mutual exclusion, partial, repeated, and selective inheritance. The single inheritance and multiple inheritances are used by the primary inheritances. Where the inheritance is only one super-class then that is known as single inheritance. On the other hand when the subclass inherits from more than one super-class it is known as multiple inheritance.