< b="" />Fundamental Operations in Relational Algebra< />

- Relational algebra is a formal query language used to perform operations on relational databases. It consists of a set of operations that manipulate relations or tables in a database.

< b="" />Set Intersection< />

- Set intersection is not a fundamental operation in relational algebra. It involves finding the common elements between two sets or relations. However, it is not part of the basic operations defined in relational algebra.

< b="" />Natural Join< />

- Natural join is a fundamental operation in relational algebra. It combines two relations based on the equality of their attributes. It returns a new relation that contains all the attributes from both relations, eliminating duplicate attributes, and only including the rows where the values of the common attributes match.

< b="" />Assignment< />

- Assignment is not a fundamental operation in relational algebra. It is a process of assigning values to variables or attributes. In relational algebra, the focus is on manipulating relations rather than assigning values to variables.

< b="" />None of the Mentioned< />

- The correct answer is "None of the mentioned." Set intersection and assignment are not fundamental operations in relational algebra, while natural join is a fundamental operation. Therefore, none of the given options are fully correct.

- The fundamental operations in relational algebra include selection, projection, union, set difference, cartesian product, and rename. These operations allow for querying and manipulating data in a relational database.

- Selection is used to retrieve specific rows from a relation that satisfy a given condition.

- Projection is used to retrieve specific columns from a relation.

- Union combines two relations into a new relation, including all the rows from both relations while eliminating duplicate rows.

- Set difference returns a relation that contains the rows from one relation that do not exist in the other relation.

- Cartesian product returns a relation that combines every row from one relation with every row from another relation.

- Rename is used to change the name of attributes in a relation.

- These fundamental operations in relational algebra form the basis for performing complex queries and data manipulations in relational databases.