ECO401 Short Notes – Economics Short Notes PDF

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ECO401 Short Notes - Economics Short Notes PDF
ECO401 Short Notes – Economics Short Notes PDF

 

The database standard proposed by ANSI SPARK in 1975 is used worldwide and is the single most popular agreed-upon standard for database systems. The Three Level Schema architecture provides us with a number of advantages. For with access to data at different levels we have a number of users because not all of them
users must access the data in the database at all levels of the database.

3 levels architecture allows us to separate the physical representation of data from user views of data. In a database, the same data is stored in a specific executable format and is available to different users in different formats according to the wishes of different users. For example, we believe that we have stored the DOB (Date of Birth) in the database in a particular format, such as dd-mm-yyyy (for example, 28-03-1987).

However, users from different departments may require to display the date of birth in different forms; examination department may ask to display as month-day-yyyy (as March-28-1987) the registry office may request to display the date of birth as mm/dd/yyyy, however the library may need it in dd/mm/yy format. Tree
Level Schema allows us to externally access data in various formats level, which is stored in a specific format at the internal level.

ECO401 Short Notes – Economics Short Notes PDF

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