Which of the following is NOT an operation in relational algebra?SelectionProjectionInsertionJoin

Answer:

To determine which of the options is NOT an operation in relational algebra, let’s briefly describe each of the provided terms:

1. Selection: This operation is used to filter rows from a relation based on a specified condition. It is one of the basic operations in relational algebra.

2. Projection: This operation is used to select specific columns from a relation. Like selection, it is also a fundamental operation in relational algebra.

3. Insertion: This term refers to adding new rows to a relation. However, insertion is not considered a fundamental operation in relational algebra; instead, it is typically associated with database management operations.

4. Join: This operation combines tuples from two relations based on a related attribute between them. Join is a crucial operation in relational algebra.

Summary:

Based on the descriptions above, the operation that is NOT part of relational algebra is Insertion.