Explain the difference between external internal and conceptual schemas

DBMS Schemas: Internal, Conceptual, External

explain the difference between external internal and conceptual schemas

Explain the difference between external, internal, and conceptual schemas. How are those different schema layers related to the concepts of logical and physical.

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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 s. It proposes three different views in systems development, with conceptual modelling being considered the key to achieving data integration. The three-schema approach provides for three types of schemas with schema techniques based on formal language descriptions: [3]. At the center, the conceptual schema defines the ontology of the concepts as the users think of them and talk about them. The physical schema according to Sowa "describes the internal formats of the data stored in the database , and the external schema defines the view of the data presented to the application programs.

ER Model is best used for the conceptual design of a database. Set Difference. By making additional assumptions, if so required, drawn an E- R diagram for the above situation. The conceptual schema hides the details of physical storage structures and Each external schema describes the part of the database that a particular user c Differentiate between fixed length and variable length records. Logical data independence indicates that the conceptual schema can be since, conceptually, there is no difference in the operations carried out against the data. Designers find it easier to deal with conceptual data representation, freeing them from the Explain how the entity relationship ER model helped produce a more Using the ER diagram, it's easy to map the ERM to the relational database What is the difference between an object and a class in the object oriented data. Read an E-R diagram and explain what it reveals about the business activities and Developing the contextual-, external-and internal- level schemas design stage.

We know that three view-levels are described by means of three schemas. These schemas are stored in the data dictionary. In DBMS, each user refers only to its own external schema.
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Database systems comprise of complex data structures. Thus, to make the system efficient for retrieval of data and reduce the complexity of the users, developers use the method of Data Abstraction. The internal schema is a very low-level representation of the entire database. It contains multiple occurrences of multiple types of internal record. In the ANSI term, it is also called "stored record'.

Chat or rant, adult content, spam, insulting other members, show more. Harm to minors, violence or threats, harassment or privacy invasion, impersonation or misrepresentation, fraud or phishing, show more. Yahoo Answers. Explain the difference between external, internal and concetual schemas.? Report Abuse. Are you sure you want to delete this answer? Yes No.



Explain the difference between external, internal and concetual schemas.?

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In the ANSI term, it is also called "stored record'. Facts about Internal schema: The internal schema is the lowest level of data abstraction.
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4 COMMENTS

  1. Jessica R. says:







  2. Fito T. says:

    External Schemas are those which are being experienced by the users. 2. Conceptual Schemas are to integrate External Schemas. newwaveswing.comal.

  3. Jill S. says:

    The internal schema describes how the data will be physically stored and accessed, using the facilities provided by a particular DBMS.

  4. Tarence H. says:

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