Managing databases, Database Management System

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Code an Oracle Database trigger to enforce the constraint that an employee can
never change his or her department.

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These are interactive interfaces, graphical that hide the difficulty of the DBMS and query language behind an intuitive, simple to understand, and convenient interface. This permit

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What is the use of with clause in SQL? The with clause gives a way of defining a temporary view whose explanation is available only to the query in which the with clause occurs

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What are the uses of the information in the Data dictionary? The following information is directly taken from the Data dictionary: Information on fields displayed with

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Use of partial data by applications : In common, applications work with views rather than whole relations. Thus, it may be more appropriate to work with subsets of relations rather

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ALTER TABLE Command : This command is used for variation of existing structure of the table in the given situation: When a new column is to be added to the table structure.

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