Which of the following is used to denote the selection operation in relational algebra?a.Lambda (Greek)b.Sigma (Greek)c.Omega (Greek)d.Pi (Greek)

Break Down the Problem

1. Identify the operation related to selection in relational algebra.
2. Evaluate each option given in the multiple-choice question.

Relevant Concepts

• In relational algebra, the selection operation is used to retrieve rows from a relation that satisfy a specific condition.
• The selection operation is typically denoted by the Greek letter Sigma (Σ).

Analysis and Detail

1. Lambda (Λ): This symbol is not associated with the selection operation.
2. Sigma (Σ): This symbol represents the selection operation in relational algebra, which filters rows based on a condition.
3. Omega (Ω): This symbol is not standard for any common operation in relational algebra.
4. Pi (Π): This symbol denotes the projection operation, which is used to retrieve specific columns from a relation.

Verify and Summarize

• The only symbol that corresponds to the selection operation is Sigma (Σ), confirming it through the evaluation of the symbols provided.

Final Answer

b. Sigma (Greek) is used to denote the selection operation in relational algebra.