Relational database, Database Management System

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write on the various type of relationalkey

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What are the disadvantages of file processing system? The drawbacks of file processing systems are a) Data redundancy and inconsistency b) Complexity in accessing data

Outer join, Outer Join: The use of Outer Join is that it still joins those...

Outer Join: The use of Outer Join is that it still joins those tuples that do not have matching values in common columns are also contained in the result table. Outer join places

What is the aim of logical schema, What is the aim of logical schema ? ...

What is the aim of logical schema ? The main motive of the logical schema is to ensure the portability of procedures and models on various physical schemas at runtime.

Databases and data warehouses , Databases and data warehouses both are data...

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What sorts of tables one can se in designing the hierarchy of a LDB? Tables, which are having Foreign Key relations.

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What is a function group? A function group is a collection of logically related modules that share global data with every other.  All the modules in the group are contained in

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What is persistency? Persistency ensures which data is stored and that after the object is no longer available (program stops running) the data will be available to other users

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Explain the challenges before an E-business management.

Example-revoke all on emp from mca12, Example:  //REVOKE ALL ON EMP FROM MC...

Example:  //REVOKE ALL ON EMP FROM MCA12;                              (All permissions will be cancelled) You can also cancel only some of the permissions. Drop: A user-

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