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The notation describes relationships between logical records, individual entities, entity classes or a combination of these objects.A logical record is a collection of data elements related to an entity.
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An entity class is a group of entities that are sufficiently similar in terms of the attributes that describe the entities. A DSD may depict as many entity classes and relationships as required to model the information structure studied.
Two basic graphic symbols are used to build a DSD, that is, a rectangle and an arrow. These symbols do not indicate how many individual entities constitute each entity class.
This relationship indicates that each Department comprises one to many Employee .