Question: The select operation selects tuples that satisfy a given predicate. We use the lowercase______ to denote selection
Answer:
For example to select those tuples of the customer relation where the customer-name is ‘LEO’, we write
σ customer-name=’LEO’ (customer)
MCQ: The select operation selects tuples that satisfy a given predicate. We use the lowercase______ to denote selection
Correct Answer:
A. Greek letter rho (ρ)
Explanation:
For example to select those tuples of the customer relation where the customer-name is ‘LEO’, we write
σ customer-name=’LEO’ (customer)
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Related Questions
- 1. Suppose we want to list all loan numbers and the amount of the loans, but do not care about the branch name. Which of the following operation allows us to produce this relation?
- 2. The Project operation selects tuples with some attributes that we wish to include but some attribute we do not want to include in the final relation. We use the lowercase______ to denote Project operation.
- 3. The Binary operation Union, denoted, as in the set theory by _____
- 4. If we want to include attributes from two different relations, which of the following operations is needed?
- 5. Which of the following operation allows us to find the tuples that are in one relation but are not in another relation?
- 6. Which of the following operation, denoted by cross (×), allows to combine the information from any two relation.
- 7. Suppose we wish to find all customers who have both a loan and an account. Which of the following operation allows us to produce this relation?
- 8. Which of the following operation that allows us to combine certain selections and a Cartesian product into one operation?
- 9. Natural join operation is denoted by symbol____
- 10. It is convenient at times to write a relational algebra expression by assigning parts of it to temporary relation variables. Which of the following operation will be used for that?
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