Question

what is natural join operator in relational algebra give its syntax​ and example too??

Answer 1

Answer:

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Answer 2

Natural join operator in relational algebra:

• A natural join is a binary operator.

• A natural join is an operator which is used to generates an 'implicit join' clause based on the 'standard columns' in the two tables being linked.

• There are mainly two types of join: Inner Join and Outer Join.

• Inner Join are of three types, these are Theta Join, Equi join and  Natural Join.

• Outer Join are of three types, these are Left Outer Join, Right Outer Join.

Syntax for Natural Join:

SELECT $\star$

FROM table1

NATURAL JOIN table2;

The example of Natural join is as follows:

• Consider two relations one of Student having Student ID and Course Id and the other is  of Instructor having Course id and Instructor name.

• Now if we calculate natural join of student and instructor relation , we get a new relation having student Id, course Id and Instructor name.

• Syntax is :   Student ⋈ Instructor

Learn more about Relational algebra

Natural Join  is used for relations which have common attribute between them.

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