What is the definition of an external schema?
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What is the definition of an external schema?
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- A three-schema design has three levels, and at each level, requests are turned into results.The following are the objectives for the design of the logical schema:A three-level architecture is known as a three-schema architecture, and it is characterised by the fact that requests are transformed into outcomes at each of the three levels.
- Among the logical schema's design objectives are the following:In a three-schema design, requests are translated into results at each of the three tiers.173. The graphical representation of database description is called a. dynamic schema diagram b. schema diagram c. structure diagram d. entity path diagram
- In a three-schema architecture, requests are translated into outcomes at each of the three levels.How can one model inheritance relationships in a database schema?167. In Three-Schema Architecture, the schema which gives details about data types, constraints and entities is classified as a. internal schema b. external schema c. logical schema d. conceptual schema