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Choose the option that correctly explains in words, the function of the following relational algebra expressionσyear≥2009 (book ⋈ borrow)
- a)Selects all tuples from the Cartesian product of book and borrow
- b)Selects all the tuples from the natural join of book and borrow wherever the year is lesser than 2009
- c)Selects all the tuples from the natural join of book and student wherever the year is greater than or equal to 2009
- d)Selects all tuples from the Cartesian product of book and borrow wherever the year is greater than or equal to 2009
Correct answer is option 'B'. Can you explain this answer?
Most Upvoted Answer
Choose the option that correctly explains in words, the function of th...
The condition under the select statement represents the condition that must be satisfied by the tuples and the symbol ⋈ represents natural join between the two relations on either side of the operator.
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Choose the option that correctly explains in words, the function of th...
Explanation:
Selection Operator (σ):
- The selection operator in relational algebra is denoted by the symbol σ.
- It is used to select tuples that satisfy a specific condition from a relation.
Given Expression: σyear≥2009 (book borrow)
- This expression is a selection operation on the Cartesian product of the 'book' and 'borrow' relations.
- It selects all the tuples where the 'year' attribute is greater than or equal to 2009 from the Cartesian product of 'book' and 'borrow' relations.
Cartesian Product:
- The Cartesian product of two relations combines every tuple from the first relation with every tuple from the second relation.
- It results in a new relation with the number of tuples equal to the product of the number of tuples in the two input relations.
Explanation of Correct Answer (Option B):
- Option B correctly explains the function of the given relational algebra expression.
- It selects all the tuples from the Cartesian product of 'book' and 'borrow' relations wherever the 'year' is lesser than 2009.
- This means that it filters out tuples where the 'year' is greater than or equal to 2009.
Therefore, the correct explanation is that the given relational algebra expression selects all the tuples from the Cartesian product of 'book' and 'borrow' relations wherever the 'year' is lesser than 2009.
Selection Operator (σ):
- The selection operator in relational algebra is denoted by the symbol σ.
- It is used to select tuples that satisfy a specific condition from a relation.
Given Expression: σyear≥2009 (book borrow)
- This expression is a selection operation on the Cartesian product of the 'book' and 'borrow' relations.
- It selects all the tuples where the 'year' attribute is greater than or equal to 2009 from the Cartesian product of 'book' and 'borrow' relations.
Cartesian Product:
- The Cartesian product of two relations combines every tuple from the first relation with every tuple from the second relation.
- It results in a new relation with the number of tuples equal to the product of the number of tuples in the two input relations.
Explanation of Correct Answer (Option B):
- Option B correctly explains the function of the given relational algebra expression.
- It selects all the tuples from the Cartesian product of 'book' and 'borrow' relations wherever the 'year' is lesser than 2009.
- This means that it filters out tuples where the 'year' is greater than or equal to 2009.
Therefore, the correct explanation is that the given relational algebra expression selects all the tuples from the Cartesian product of 'book' and 'borrow' relations wherever the 'year' is lesser than 2009.
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Choose the option that correctly explains in words, the function of the following relational algebra expressionσyear≥2009 (book borrow)a)Selects all tuples from the Cartesian product of book and borrowb)Selects all the tuples from the natural join of book and borrow wherever the year is lesser than 2009c)Selects all the tuples from the natural join of book and student wherever the year is greater than or equal to 2009d)Selects all tuples from the Cartesian product of book and borrow wherever the year is greater than or equal to 2009Correct answer is option 'B'. Can you explain this answer?
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Choose the option that correctly explains in words, the function of the following relational algebra expressionσyear≥2009 (book borrow)a)Selects all tuples from the Cartesian product of book and borrowb)Selects all the tuples from the natural join of book and borrow wherever the year is lesser than 2009c)Selects all the tuples from the natural join of book and student wherever the year is greater than or equal to 2009d)Selects all tuples from the Cartesian product of book and borrow wherever the year is greater than or equal to 2009Correct answer is option 'B'. Can you explain this answer? for Computer Science Engineering (CSE) 2024 is part of Computer Science Engineering (CSE) preparation. The Question and answers have been prepared according to the Computer Science Engineering (CSE) exam syllabus. Information about Choose the option that correctly explains in words, the function of the following relational algebra expressionσyear≥2009 (book borrow)a)Selects all tuples from the Cartesian product of book and borrowb)Selects all the tuples from the natural join of book and borrow wherever the year is lesser than 2009c)Selects all the tuples from the natural join of book and student wherever the year is greater than or equal to 2009d)Selects all tuples from the Cartesian product of book and borrow wherever the year is greater than or equal to 2009Correct answer is option 'B'. Can you explain this answer? covers all topics & solutions for Computer Science Engineering (CSE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Choose the option that correctly explains in words, the function of the following relational algebra expressionσyear≥2009 (book borrow)a)Selects all tuples from the Cartesian product of book and borrowb)Selects all the tuples from the natural join of book and borrow wherever the year is lesser than 2009c)Selects all the tuples from the natural join of book and student wherever the year is greater than or equal to 2009d)Selects all tuples from the Cartesian product of book and borrow wherever the year is greater than or equal to 2009Correct answer is option 'B'. Can you explain this answer?.
Choose the option that correctly explains in words, the function of the following relational algebra expressionσyear≥2009 (book borrow)a)Selects all tuples from the Cartesian product of book and borrowb)Selects all the tuples from the natural join of book and borrow wherever the year is lesser than 2009c)Selects all the tuples from the natural join of book and student wherever the year is greater than or equal to 2009d)Selects all tuples from the Cartesian product of book and borrow wherever the year is greater than or equal to 2009Correct answer is option 'B'. Can you explain this answer? for Computer Science Engineering (CSE) 2024 is part of Computer Science Engineering (CSE) preparation. The Question and answers have been prepared according to the Computer Science Engineering (CSE) exam syllabus. Information about Choose the option that correctly explains in words, the function of the following relational algebra expressionσyear≥2009 (book borrow)a)Selects all tuples from the Cartesian product of book and borrowb)Selects all the tuples from the natural join of book and borrow wherever the year is lesser than 2009c)Selects all the tuples from the natural join of book and student wherever the year is greater than or equal to 2009d)Selects all tuples from the Cartesian product of book and borrow wherever the year is greater than or equal to 2009Correct answer is option 'B'. Can you explain this answer? covers all topics & solutions for Computer Science Engineering (CSE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Choose the option that correctly explains in words, the function of the following relational algebra expressionσyear≥2009 (book borrow)a)Selects all tuples from the Cartesian product of book and borrowb)Selects all the tuples from the natural join of book and borrow wherever the year is lesser than 2009c)Selects all the tuples from the natural join of book and student wherever the year is greater than or equal to 2009d)Selects all tuples from the Cartesian product of book and borrow wherever the year is greater than or equal to 2009Correct answer is option 'B'. Can you explain this answer?.
Solutions for Choose the option that correctly explains in words, the function of the following relational algebra expressionσyear≥2009 (book borrow)a)Selects all tuples from the Cartesian product of book and borrowb)Selects all the tuples from the natural join of book and borrow wherever the year is lesser than 2009c)Selects all the tuples from the natural join of book and student wherever the year is greater than or equal to 2009d)Selects all tuples from the Cartesian product of book and borrow wherever the year is greater than or equal to 2009Correct answer is option 'B'. Can you explain this answer? in English & in Hindi are available as part of our courses for Computer Science Engineering (CSE).
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ample number of questions to practice Choose the option that correctly explains in words, the function of the following relational algebra expressionσyear≥2009 (book borrow)a)Selects all tuples from the Cartesian product of book and borrowb)Selects all the tuples from the natural join of book and borrow wherever the year is lesser than 2009c)Selects all the tuples from the natural join of book and student wherever the year is greater than or equal to 2009d)Selects all tuples from the Cartesian product of book and borrow wherever the year is greater than or equal to 2009Correct answer is option 'B'. Can you explain this answer? tests, examples and also practice Computer Science Engineering (CSE) tests.
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