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Consider the relations r(A, B) and s(B, C), where s.B is a primary key and r.B is a foreign key referencing s.B. Consider the query
Q: r⋈(σB<5(s))
Let LOJ denote the natural left outer-join operation. Assume that r and s contain no null values. Which one of the following is NOT equivalent to Q?
Q: r⋈(σB<5(s))
Let LOJ denote the natural left outer-join operation. Assume that r and s contain no null values. Which one of the following is NOT equivalent to Q?
- a)σB<5(r ⋈ s)
- b)σB<5(r LOJ s)
- c)r LOJ (σB<5(s))
- d)σB<5(r)LOJ s
Correct answer is option 'C'. Can you explain this answer?
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Verified Answer
Consider the relations r(A, B) and s(B, C), where s.B is a primary key...
Since, we are joining/LOJ using attribute B which is primary key of table s and foreign key of table r. So, we need to apply condition σB<5 on left table of join always, i.e., table r because left outer join (LOJ) returns all the values from an inner join plus all values in the left table that do not match to the right table. So, option (C) is correct.
Most Upvoted Answer
Consider the relations r(A, B) and s(B, C), where s.B is a primary key...
A, B) JOIN s(B, C) WHERE s.C = 'value'
This query performs an inner join between relation r and s on the attribute B. The WHERE clause filters the result to only include rows where the value of attribute C in relation s is equal to 'value'. This effectively retrieves all the rows from r that have a matching foreign key value in s and where the value of attribute C in s is equal to 'value'.
This query performs an inner join between relation r and s on the attribute B. The WHERE clause filters the result to only include rows where the value of attribute C in relation s is equal to 'value'. This effectively retrieves all the rows from r that have a matching foreign key value in s and where the value of attribute C in s is equal to 'value'.
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Consider the relations r(A, B) and s(B, C), where s.B is a primary key and r.B is a foreign key referencing s.B. Consider the queryQ: r⋈(σB<5(s))Let LOJ denote the natural left outer-join operation. Assume that r and s contain no null values. Which one of the following is NOT equivalent to Q?a)σB<5(r ⋈ s)b)σB<5(r LOJ s)c)r LOJ (σB<5(s))d)σB<5(r)LOJ sCorrect answer is option 'C'. Can you explain this answer?
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Consider the relations r(A, B) and s(B, C), where s.B is a primary key and r.B is a foreign key referencing s.B. Consider the queryQ: r⋈(σB<5(s))Let LOJ denote the natural left outer-join operation. Assume that r and s contain no null values. Which one of the following is NOT equivalent to Q?a)σB<5(r ⋈ s)b)σB<5(r LOJ s)c)r LOJ (σB<5(s))d)σB<5(r)LOJ sCorrect answer is option 'C'. 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 Consider the relations r(A, B) and s(B, C), where s.B is a primary key and r.B is a foreign key referencing s.B. Consider the queryQ: r⋈(σB<5(s))Let LOJ denote the natural left outer-join operation. Assume that r and s contain no null values. Which one of the following is NOT equivalent to Q?a)σB<5(r ⋈ s)b)σB<5(r LOJ s)c)r LOJ (σB<5(s))d)σB<5(r)LOJ sCorrect answer is option 'C'. 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 Consider the relations r(A, B) and s(B, C), where s.B is a primary key and r.B is a foreign key referencing s.B. Consider the queryQ: r⋈(σB<5(s))Let LOJ denote the natural left outer-join operation. Assume that r and s contain no null values. Which one of the following is NOT equivalent to Q?a)σB<5(r ⋈ s)b)σB<5(r LOJ s)c)r LOJ (σB<5(s))d)σB<5(r)LOJ sCorrect answer is option 'C'. Can you explain this answer?.
Consider the relations r(A, B) and s(B, C), where s.B is a primary key and r.B is a foreign key referencing s.B. Consider the queryQ: r⋈(σB<5(s))Let LOJ denote the natural left outer-join operation. Assume that r and s contain no null values. Which one of the following is NOT equivalent to Q?a)σB<5(r ⋈ s)b)σB<5(r LOJ s)c)r LOJ (σB<5(s))d)σB<5(r)LOJ sCorrect answer is option 'C'. 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 Consider the relations r(A, B) and s(B, C), where s.B is a primary key and r.B is a foreign key referencing s.B. Consider the queryQ: r⋈(σB<5(s))Let LOJ denote the natural left outer-join operation. Assume that r and s contain no null values. Which one of the following is NOT equivalent to Q?a)σB<5(r ⋈ s)b)σB<5(r LOJ s)c)r LOJ (σB<5(s))d)σB<5(r)LOJ sCorrect answer is option 'C'. 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 Consider the relations r(A, B) and s(B, C), where s.B is a primary key and r.B is a foreign key referencing s.B. Consider the queryQ: r⋈(σB<5(s))Let LOJ denote the natural left outer-join operation. Assume that r and s contain no null values. Which one of the following is NOT equivalent to Q?a)σB<5(r ⋈ s)b)σB<5(r LOJ s)c)r LOJ (σB<5(s))d)σB<5(r)LOJ sCorrect answer is option 'C'. Can you explain this answer?.
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ample number of questions to practice Consider the relations r(A, B) and s(B, C), where s.B is a primary key and r.B is a foreign key referencing s.B. Consider the queryQ: r⋈(σB<5(s))Let LOJ denote the natural left outer-join operation. Assume that r and s contain no null values. Which one of the following is NOT equivalent to Q?a)σB<5(r ⋈ s)b)σB<5(r LOJ s)c)r LOJ (σB<5(s))d)σB<5(r)LOJ sCorrect answer is option 'C'. Can you explain this answer? tests, examples and also practice Computer Science Engineering (CSE) tests.
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