Answer-Which of the following is NOT a valid relational algebra operation?

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Relational algebra is a theoretical language used for querying and manipulating relations tables in a relational database. The key operations in relational algebra are    UNION  Combines the results of two queries and returns distinct rows present in either relation.   INTERSECT  Returns the rows that are present in both relations.   DIFFERENCE  Returns rows from the first relation that are not in the second relation.   SELECT  A unary operation that retrieves a subset of rows from a relation based on a condition.   However, JOIN is not part of basic relational algebra. It is an extension of relational algebra that combines tuples from two relations based on a condition e.g., an equality condition. Although it is commonly used in relational databases, it is technically not a basic relational algebra operation.   Why other options are incorrect    A, B, C, and E are all valid relational algebra operations, as they represent basic operations to manipulate and retrieve data from relations.

Which of the following is NOT a valid relational algebra operation?

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