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This is the foremost used kind of be a part of. In equi–join rows ar joined on the premise of values of a standard attribute between the 2 relations. It means that relations ar joined on the basis of common attributes between them; that ar meaty.
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This implies on the basis of primary key, that may be a foreign key in another relation. Rows having the same worth within the common attributes ar joined. Common attributes seem double in the output.
It implies that the attributes, that ar common in each relations, appear twice, however solely those rows, that ar chosen. Common attribute with constant name is qualified with the relation name within the output.
It implies that if primary and foreign keys of 2 relations ar having constant names and if we tend to take the equi – be a part of of each then within the output relation the relation name can precede the attribute name.
The Intersection Operation:
The intersection operation additionally has the need that each the relations ought to be
union compatible, which implies they’re of same degree and same domains. It is
represented described. If R and S ar 2 relations and that we take intersection of those 2
relations then the ensuing relation would be the set of tuples, that ar in each R and S. similar to union intersection is additionally independent.