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List the set operations of SQL?
1) Union
2) Intersect operation
3) The except operation
A Functional dependency is described by X Y between two groups of attributes Y and X that are subsets of R specifies a constraint on the possible tuple that can make a relation
Consider the two relations given below Given that A is the primary key of R, D is the primary key of S and there is a referential integrity among S.A and R.A, discuss all
For the relations R and S given below: R S A B C 1 4 7 2 5 8 3 6 9
how the string works as keyword?
write short note on mobile database
What are the advantages of object oriented databases in comparison with others? Why it is still not widely used? Object oriented designs are coherent, efficient and less prone
What is vertical fragmentation? Vertical fragmentation divides the relation by decomposing the scheme R of relation r.
In an E-R diagram an entity set is represent by? In an E-R digram entity set is represted by rectangle.
What is Interaction Diagram An interaction diagram shows an interaction, comprises of a set of objects and their relationships including the messages that may be dispatched be
design a generalization specialization hierarchy for a motor vehicle sales company. the company sells motorcycles, passenger cars, vens and buses.
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