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Visio 2019 conceptual logical data model software#
The relational model – where data is described in terms of tables and columns – had just been recognized as a data organization theory but no software existed to support that approach. When ANSI first laid out the idea of a logical schema in 1975, the choices were hierarchical and network. This is not the only way to look at data models, but it is a useful way, particularly when comparing models".
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The ANSI/SPARC three level architecture, which "shows that a data model can be an external model (or view), a conceptual model, or a physical model. While the two concepts are closely related, and have overlapping goals, a domain model is more focused on capturing the concepts in the problem domain rather than the structure of the data associated with that domain. The term 'Logical Data Model' is sometimes used as a synonym of ' domain model' or as an alternative to the domain model. Even so, since the logical data model anticipates implementation on a specific computing system, the content of the logical data model is adjusted to achieve certain efficiencies. Logical data models should be based on the structures identified in a preceding conceptual data model, since this describes the semantics of the information context, which the logical model should also reflect. Once validated and approved, the logical data model can become the basis of a physical data model and form the design of a database. They are often diagrammatic in nature and are most typically used in business processes that seek to capture things of importance to an organization and how they relate to one another. Logical data models represent the abstract structure of a domain of information.
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