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- Aggregation is a concept in database design and object-oriented programming. It represents a relationship between entities, where one entity can exist independently of the other. Here are some examples of aggregation:
- Class (parent) and Student (child): Deleting the Class does not affect the Students1.
- Aggregate values like sum or average in data analysis2.
- Employee working on a project and requiring machinery3.
- Employee and Address: An Employee object contains an Address object, and both can survive independently4.
- Department and Students: A department can have students, but vice versa is not possible5.
Learn more:✕This summary was generated using AI based on multiple online sources. To view the original source information, use the "Learn more" links.Aggregation implies a relationship where the child can exist independently of the parent. Example: Class (parent) and Student (child). Delete the Class and the Students still exist. Composition implies a relationship where the child cannot exist independent of the parent. Example: House (parent) and Room (child).www.visual-paradigm.com/guide/uml-unified-model…A simple example of an aggregate value is a sum or average. This aggregated data is used in analysis, reporting, dashboarding, and other data products to inform decision-making. Aggregating data can speed up time-to-insight, improve efficiency, and decision-making.coefficient.io/data-aggregationAggregation is an abstraction through which we can represent relationships as higher-level entity sets. For Example, an Employee working on a project may require some machinery. So, REQUIRE relationship is needed between the relationship WORKS_FOR and entity MACHINERY.www.geeksforgeeks.org/generalization-specializati…If a class have an entity reference, it is known as Aggregation. Aggregation represents HAS-A relationship. Consider a situation, Employee object contains many informations such as id, name, emailId etc. It contains one more object named address, which contains its own informations such as city, state, country, zipcode etc. as given below.www.javatpoint.com/aggregation-in-javaIt is a special form of Association where:
- It represents Has-A’s relationship.
- It is a unidirectional association i.e. a one-way relationship. For example, a department can have students but vice versa is not possible and thus unidirectional in nature.
www.geeksforgeeks.org/association-composition-a… - People also ask
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