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What is candidate key?
Candidate Key - A candidate key of an entity set is a minimal superkey, which uniquely identifies each row in the relation.
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what is the relationship between receipt and owner entities in computer sales and service company
Creating views with Read only option : In the view definition this option is used to make sure that no DML operations can be done on the view.
Given the subsequent relations: vehicle (reg_no, make, colour) Person (eno, name, address) Owner (eno, reg_no) Write expressions
please describe the data base management with the easy example &give the application?
Update or Modify operation alters the existing values. If these operations alter the value that is the foreign key also, the only check need is the similar as that of the Insert op
The Update Operations : Update operations are used for altering database values. The constraint violations faced by this operation are logically the similar as the problem faced
In an E-R diagram an entity set is represent by? In an E-R digram entity set is represted by rectangle.
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