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Define an abstraction by which relationships are treated as higher level entities
Ans: Aggregation.
It is an abstraction by which relationships are treated as higher level entities Aggregation. (In ER diagram, aggregation is utilized to denote a relationship as an entity set.)
Increases efficiency : Data is stored close to most often used site, therefore retrieval would be faster. Also, data that is not required by local applications is not stored, there
The advantages of a database management system (DBMS) include :- Data integrity and elimination of duplication.
What are multiple inheritances? Multiple inheritances allow a class to inherit variables and methods from many super classes.
Question: In relation to distributed database answer the following questions: (i) Give a brief definition of distributed database. Support your answer with an appropriate di
a need some real life examples of database management systems three level of ANSI SPARC architecture life teacher and student ,company and employee or for NGO etc.
Define the terms i) DDL ii) DML DDL: Data base schema is particular by a set of definitions expressed by a special language known as a data definition language. DML: A data
Normal 0 false false false EN-US X-NONE X-NONE MicrosoftInternetExplorer4
Define Query by Example QBE is a query language relies upon domain calculus and has two dimensional syntax. The queries are written in the horizontal and vertical dimensions of
By using the delete operation some consisting records can be deleted from a relation. To delete some definite records from the database a condition is also specified based on which
how many hourse have been spent on a certain project
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