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What is Functional Dependency?
A Functional dependency is shown by X Y among two sets of attributes X and Y that are subsets of R specifies a constraint on the possible tuple that can form a relation state r of R. The constraint is for any two tuples t1 and t2 in r if t1[X] = t2[X] then they have t1[Y] = t2[Y]. This means the value of X component of a tuple uniquely verifies the value of component Y.
what is natural join?
Consider the subsequent relation schemes: Project (Project#, Project_name, chief_architect) Employee (Emp#, Empname) Assigned_To (Project#, Emp#) Give expression i
Enumerate or state the steps in creating a relevant database of a shop.
Define access time. Access time is the time from when a read or write request is issued to when data transfer starts.
QUESTION (a) Consider a car database consisting of car model, car make, car origin, Engine capacity, color, cost.
State about the Activity Diagram Activity diagrams show flow from one activity to other. It is an ongoing non atomic execution within a state machine. Activity finally results
Why a report generator is used ? Report generator is used for print files on paper.
A practice called Perfect Pets provides private health care for domestic pets throughout America. This service is provided through various clinics located in the main cities of Ame
Hierarchical model is also known by? A hierarchical model is also known as a Tree structure.
explain cascading rollback
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