union:

the term of the relation as performed by combining the tuples from one

relation with those a second relation to produce a third

relation.duplicate tuples are eliminated.the the relation must be union

compatable.

difference:

the difference of two relations is a third relation having tuples that occur in

the first relation but not in the second relation.

intersection:

the intersection operation selects the common tuples from the two relations.

cartesian product:

the cartesian product of two relations is the concatination of tuples belonging

to the two relations.a new resultant scheme is created consisting of

concatination of all possible combination of tuples.