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
What sorts of tables one can se in designing the hierarchy of a LDB? Tables, which are having Foreign Key relations.

What is indexed sequential file organization? What are the applications of this organization?  Ans: An index file can be employed to effectively overcome the problem of storing

What is the purpose of tables, private synonyms and public synonyms? If there are multiple objects of similar name on an Oracle database, that order are they accessed in? The r

how to construct labelled precedence graph for view serialiability.please explain insteps with one solved examples

Define the phases of two phase locking protocol Growing phase: a transaction may get locks but not release any lock. Shrinking phase: a transaction might be release locks bu

what is object-identity

lock and types of lock

What is object identity? An object retains its identity even if some or all the values of variables or explanations of methods change overtime.

A database has been designed for this beauty parlour in order for the staff to manage specific things such as bookings made by clients, payments, staff availability, level of exper

What are the Requirements of algorithm designer Algorithm designer should: i) Select proper algorithm so as to minimize implementation cost ii) Find most appropriate d