Bapineedu Bollempalli

 Profile Answers by Bapineedu Bollempalli 

• Sep 18th, 2011

 

A concept which is used to model a relationship between a collection of entities and relationships. It is used when we need to express a relationship among relationships.

Aggregation - a feature of the entity relationship model that allows a relationship set to participate in another relationship set. This is indicated on an ER diagram by drawing a dashed box around the aggregation.

kumar

• Oct 1st, 2011

 

collection of entities...

joyce shelton

• Apr 8th, 2013

 

Summarized data

Anuj

• Nov 10th, 2013

 

The Process through which one can treat the relationship as higher level entities is known as aggregation.

IRFAN AHMED SHARFI

• Jun 6th, 2014

 

Aggregation is an abstraction through which relationship are treated as higher level entity..

Sergey Alentyev

• Mar 29th, 2015

 

Aggregation means assembling component parts together. So, it is not just about relationship. For example, I had separate Customer table that had address_id column linked to Address table. For some reason (probably performance) I decided to replace foreign key link address_id by real address values like street address, city, zip code, etc. This is an aggregation. Not necessary a de-normalization.

Radha

• Jun 2nd, 2015

 

When a relationship between two entities is considered as a single entity and again this single entity has a relationship with another entity, this is called an aggregation

avadh don

• Oct 13th, 2015

 

Aggregation is the process of compiling information on an object, thereby abstracting a higher level object

anupam jha

• Oct 31st, 2016

 

Aggregation is a process when relation between two entities is treated as a single entity. Here the relation between center and course, is acting as an entity in relation with visitor.

Mohammed Bhaijaan

• Nov 3rd, 2016

 

Aggregration is a process when relation between two entity is treated as a single entity. eg. two enties center, course. the relation between Center and Course, is acting as an Entity in relation with Visitor.

Sumayya

• Jan 9th, 2017

 

Aggregation can be used when we need to express a relationship among relationships.

Vishnu

• Jul 16th, 2017

 

To get aggregate values of a column. For example sum(quantities) sold of a product in a day.

Ajmal Hussain

• Nov 25th, 2017

 

Aggregation of processes, when two entities are treated as a single entities then it is known as aggregation.
Here center and courses are acting as a single entitys and then enquires with visitors relationship does not accept ternary relationships, So it is improved by aggregation.
So it is combined two entities and treat as a single entity.

Nitin Rathod

• Apr 14th, 2018

 

Aggregation is an abstraction through which relationships are treated as a higher level entities
Ex :- There exites a ternary relationship teaches between a teacher, department and subject entites, than relationship will be represented as.