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Explain the three levels of abstraction.

Explain the three levels of abstraction.

Answers

Simon
The three levels of abstraction are.
1.External level of abstraction-This is the users view of the database.A database will have different users with different specification,expectations and requirements, and as such each user will have a distinct view of the database.
2.Conceptual level-This is where we have the global or community view of the database. It describes the different entity types,their attributes and relationship among them.
3.Internal level-This is the actual implementation of the database in the computer. This concerns the DBMS used,the structures used,the storage devices, the security mechanisms employed etc.
mzitoh123 answered the question on March 3, 2018 at 12:03

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