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  2. Three-schema approach - Wikipedia

    en.wikipedia.org/wiki/Three-schema_approach

    The notion of a three-schema model was first introduced in 1975 by the ANSI/X3/SPARC three level architecture, which determined three levels to model data. [1]The three-schema approach, or three-schema concept, in software engineering is an approach to building information systems and systems information management that originated in the 1970s.

  3. ANSI-SPARC Architecture - Wikipedia

    en.wikipedia.org/wiki/ANSI-SPARC_Architecture

    There are three different types of schema corresponding to the three levels in the ANSI-SPARC architecture: The external schemas describe the different external views of the data, and there may be many external schemas for a given database.

  4. Database schema - Wikipedia

    en.wikipedia.org/wiki/Database_schema

    The database schema is the structure of a database described in a formal language supported typically by a relational database management system (RDBMS). The term " schema " refers to the organization of data as a blueprint of how the database is constructed (divided into database tables in the case of relational databases ).

  5. Data model - Wikipedia

    en.wikipedia.org/wiki/Data_model

    The ANSI/SPARC three level architecture. This shows that a data model can be an external model (or view), a conceptual model, or a physical model. This is not the only way to look at data models, but it is a useful way, particularly when comparing models. [5] A data model instance may be one of three kinds according to ANSI in 1975: [6]

  6. Federated database system - Wikipedia

    en.wikipedia.org/wiki/Federated_database_system

    The five level schema architecture includes the following: Local Schema is basically the conceptual model of a component database expressed in a native data model. [3] Component schema is the subset of the local schema that the owner organisation is willing to share with other users of the FDBS and it is translated into a common data model. [3]

  7. Database design - Wikipedia

    en.wikipedia.org/wiki/Database_design

    Database design is the organization of data according to a ... Three-schema approach; ... which can be an important consideration in a Microservices architecture. In ...

  8. View model - Wikipedia

    en.wikipedia.org/wiki/View_model

    The notion of a three-schema model was first introduced in 1977 by the ANSI/X3/SPARC three-level architecture, which determined three levels to model data. [12] The Three-schema approach for data modeling, introduced in 1977, can be considered one of the first view models. It is an approach to building information systems and systems ...

  9. Data modeling - Wikipedia

    en.wikipedia.org/wiki/Data_modeling

    The ANSI/SPARC three level architecture. This shows that a data model can be an external model (or view), a conceptual model, or a physical model. This is not the only way to look at data models, but it is a useful way, particularly when comparing models. [1] In 1975 ANSI described three kinds of data-model instance: [5]