![]() Generally, entity-relationship modeling can be done on different abstraction levels: on the conceptual (descriptive) level, logical (analytical) level, and physical (executive) level. Based on the Crow's foot notation there is also the possibility for NIAM-inspired modeling (Natural language Information Analysis Method). ![]() Different shapes at the ends of these lines represent the cardinality of the relation. In the Crow's foot notation entities are represented as boxes and relations as lines between the boxes. Enterprise Studio supports the Crow's foot notation. Notationĭifferent notations can be used for ERD. ERD in Enterprise StudioĪ basic understanding of entity-relationship diagrams is assumed for modeling with ERD in Enterprise Studio. Data models can be modeled on different levels, in different types of views. The data is modeled as components (entities) that are connected to each other by relations that express the dependencies and requirements between them.Īn entity-relationship model consists of one or more views with data models. ![]() Entity-relationship diagrams (ERD), or entity-relationship models, are used for describing and defining data models.
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