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Which database level is closest to the users?
External database level is closest to the users.
Relational and E-R Model There are three types of constraints on relational database that have: DOMAIN CONSTRAINT PRIMARY KEY CONSTRAINT INTEGRITY CONSTRAINT
An instance of relational schema R (A, B, C) has distinct values of A including NULL values. then A is a candidate key or not? If relational schema R (A, B, C) has distinct val
Code an Oracle Database trigger to enforce the constraint that an employee can never change his or her department.
What is object identity? An object retains its identity even if some or all the values of variables or explanations of methods change overtime.
What are the objectives of query processing? Ans: The objectives of query processing is to transform a query written in a high level language into a accurate and efficien
sir, could anybody help me in getting complete information about the mentioned topic
What are the object-oriented approaches Software systems which are designed with structured design methodology never support some of desired quality attributes for example reus
State about the Use Case Diagram A use case diagram represents a set of use cases, actors and their relationships. These diagrams shall be used to model context or requirement
In case of entity integrity, the primary key may be declared? In a case of entity integrity primary key may be not Null.
What is a recursive relationship? Give an example not used in the text. A recursive relationship is a relationship among an entity and itself. For example, given the entity PER
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