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Difference Between CARTESIAN PRODUCT & NATURAL JOINT
Cartesian product is like the cross product ie every element of one row of one table/entity is multiplied to every column of another table for solving linked queries of two tables ...
Where as natural Join is simply joining two or more entities eliminating the common attributes or columns..
@nayan answered it :)
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What are the main operations of relational algebra?
The main operations of relational algebra are 1. The select Operation 2. The projection operation 3. The union operation 4.The set different operations 5.The Cartesian-product operation. 6.The rename operation. 7.Additional operations. 8.The Set-Intersection operations. 9.Natural-join operations. 10.Division operation. 11.The Assignment operation.
Is set of numbers closed under natural and subtraction?
Please clarify what set you are talking about. There are several sets of numbers. Also, "closed under..." should be followed by an operation; "natural" is not an operation.
Is Natural numbers are closed under multiplication?
Yes.natural numbers are closed under multiplication.It means when the operation is done with natural numbers in multiplication the sum of two numbers is always the natural number.
What is the intersection between rational numbers and natural numbers?
It is the set of natural numbers.
Write in roster form Set N is the set of natural numbers between two and nine?
N={3,4,5,6,7,8}
