Is a bottom up approach in which two lower level entities?

Is a bottom-up approach in which two or more lower level entities combines to form a new higher level entity *?

Generalization is like a bottom-up approach in which two or more entities of lower level combine to form a higher level entity if they have some attributes in common. In generalization, an entity of a higher level can also combine with the entities of the lower level to form a further higher level entity.

Is top-down approach in which one higher level entity can be divided into two lower level entity?

Specialization is a top-down approach in which a higher-level entity is divided into multiple specialized lower-level entities.

What is aggregation and generalization?

Aggregation is an abstraction which turns a relationship between objects into an aggregate object. Generalization is an abstraction which turns a class of objects into a generic object.

Is a top-down approach in which one higher?

The top-down approach to management is one such strategy, in which the decision-making process occurs at the highest level and is then communicated to the rest of the team. This style can be applied at the project, team, or even the company level, and can be adjusted according to the particular group’s needs.

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Is higher level entity must belong to a lower level entity?

Explanation: If each higher level entity belongs to the lower level entity then it is called as total generalization. It is also called as total specialization. If some higher level entities do not belong, it is called as partial generalization.

Is aggregation a level of hierarchy?

Aggregation is the process of bringing pieces of data together to form a larger group. After hierarchical relationships are established, data can be viewed at any level in the hierarchy. Aggregation allows you to view data at summary levels.

What is a aggregation hierarchy?

An aggregation hierarchy is the topology of aggregate and underlying real objects. … For each path in the hierarchy, the most significant parent of the path must be an aggregate object. A most significant parent is an aggregate object that has no aggregation parents and therefore ends one or more aggregation paths.