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Increased overheads on update : On the drawbacks side, it will need the system to ensure that all replicas of a relation are consistent. This shows that all the replicas of the rel
Normal 0 false false false EN-US X-NONE X-NONE
Hierarchical
what is entity in database system?
brief history,definition,current trends and future trends if any of data fragmentation
Define a table in SQL known as Client that is used to store information about the clients. Define CLIENT_NO as the primary key whose first letter must begin with ‘C'. Also ensure t
What is the use of sub queries? A sub query is a select-from-where expression that is nested with in another query. A common use of sub queries is to do tests for set membershi
What is an index? An index is a structure that helps to place desired records of a relation quickly, without probing all records.
Explain I command in QBE ? I : It is the command in QBE that is used to insert tuple (s) into the database
Entities Let us first be aware of the question: What are entities? An entity is an object of concern used to show the things in the actual world, e.g., table, car, bo
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