Aggregation, Database Management System

Aggregation: One limitation of the E-R diagram is that they do not permit representation of relationships between relationships. In such a case the relationship along with its entities are promoted (aggregated to form an aggregate entity which can be used for expressing the needed relationships).

Posted Date: 3/6/2013 6:15:19 AM | Location : United States







Related Discussions:- Aggregation, Assignment Help, Ask Question on Aggregation, Get Answer, Expert's Help, Aggregation Discussions

Write discussion on Aggregation
Your posts are moderated
Related Questions
Evaluate, compare and contrast the two methods of relational database design namely top down method and Bottom up method. What will be your choice if you are asked to select a meth

What are referential integrity constraints? A value that appears in single relation for a given set of attributes also appears for a particular set of attributes in another rel

What is an object design? Object design is a very interactive method, which decides the relationship among objects, classifies operations on classes, determines overall system

Types of data independence Data independence can be classified into the following two types: Physical Data Independence: This means that for any change made in the physi

List some instances of collection types? a) sets b) arrays c) multisets

composite attribute

List some security violations (or) name any forms of malicious access. A) Unauthorized reading of data B) Unauthorized modification of data C) Unauthorized destruction of

Example- Search the salary of employees who are not 'ANALYST' but get a salary below than or equal to any people employed as 'ANALYST'. SELECT EMPNO, ENAME, JOB, SAL FROMEMP

Hello.I have database access assignment which consist of creation Form, Subform, Calculation, Macros

Define what Immediate database modification technique uses?  Ans: Both undo and redo.