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

1. Break Down the Problem

We need to identify which of the given options is NOT a standard operation in relational algebra. The operations listed are:

1. Selection
2. Projection
3. Insertion
4. Join
5. Next

2. Relevant Concepts

In relational algebra, the primary operations include:

• Selection: Filters rows based on a specified condition.
• Projection: Selects specific columns from a relation.
• Join: Combines two relations based on a related common attribute.
• Insertion: This is not traditionally part of relational algebra; it refers to adding new tuples to a relation and is more of a database operation.
• Next: This is not a standard operation in relational algebra.

3. Analysis and Detail

The recognized operations in relational algebra help manipulate and retrieve data from relational databases. Mentioning "Insertion" aligns more with database operations (such as SQL) than pure relational algebra. Similarly, "Next" does not relate to a standard operation in relational algebra.

4. Verify and Summarize

Checking standard references on relational algebra confirms that Insertion and Next are not traditional operations. Therefore, the correct answer is:

Final Answer

Insertion is NOT an operation in relational algebra.