Computer Science Engineering (CSE) Exam > Computer Science Engineering (CSE) Questions > Let R(a, b, c) and S(d, e, f) be two relation...
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Let R(a, b, c) and S(d, e, f) be two relations in which d is the foreign key of S that refers to the primary key of R. Consider the following four operations R and S
1. Insert into R
2. Insert into S
3. Delete from R
4. Delete from S
Which of the following is true about the referential integrity constraint above?
1. Insert into R
2. Insert into S
3. Delete from R
4. Delete from S
Which of the following is true about the referential integrity constraint above?
- a)None of 1, 2, 3 or 4 can cause its violation
- b)All of 1, 2, 3 and 4 can cause its violation
- c)Both 1 and 4 can cause its violation
- d)Both 2 and 3 can cause its violation
Correct answer is option 'D'. Can you explain this answer?
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Verified Answer
Let R(a, b, c) and S(d, e, f) be two relations in which d is the forei...
Referential integrity constraint: In relational model, two relation are related to each other over the basis of attributes, Every value of referencing attribute must be null or be available in the referenced attribute.
Here d is the foreign key of S that refers to the primary key of R.
1. Insert into R will not cause any violation.
2. Insert into S may cause violation because for each entry in ‘S ’ it must be. in ‘R ’ .
3. Delete from R may cause violation because for the deleted entry in R there may be referenced entry in the reIation S.
4. Delete from S will not cause any violation.
Hence (d) is the correct option.
Here d is the foreign key of S that refers to the primary key of R.
1. Insert into R will not cause any violation.
2. Insert into S may cause violation because for each entry in ‘S ’ it must be. in ‘R ’ .
3. Delete from R may cause violation because for the deleted entry in R there may be referenced entry in the reIation S.
4. Delete from S will not cause any violation.
Hence (d) is the correct option.
Most Upvoted Answer
Let R(a, b, c) and S(d, e, f) be two relations in which d is the forei...
Referential Integrity Constraint
The referential integrity constraint is a rule that ensures the consistency and integrity of data between two related tables in a relational database. In this case, the constraint is between the tables R and S, where the foreign key d in S references the primary key of R.
Operations on R and S
1. Insert into R: When inserting a new record into R, the referential integrity constraint is not violated because there is no relationship between the new record and the existing records in S.
2. Insert into S: When inserting a new record into S, the foreign key value d must correspond to an existing primary key value in R. If the foreign key value d does not exist in R, the referential integrity constraint is violated.
3. Delete from R: When deleting a record from R, the referential integrity constraint is not violated because the corresponding records in S are not affected. However, if the deleted record in R is referenced by any record in S (through the foreign key d), the referential integrity constraint is violated.
4. Delete from S: When deleting a record from S, the referential integrity constraint is not violated because the primary key of R is not affected. However, if the deleted record in S is referenced by any record in R (through the foreign key d), the referential integrity constraint is violated.
Analysis of Operations
Based on the above operations, we can conclude the following:
- Operation 1 (Insert into R) does not violate the referential integrity constraint.
- Operation 2 (Insert into S) can violate the referential integrity constraint if the foreign key value does not exist in the referenced table (R).
- Operation 3 (Delete from R) can violate the referential integrity constraint if the deleted record in R is referenced by any record in S.
- Operation 4 (Delete from S) can violate the referential integrity constraint if the deleted record in S is referenced by any record in R.
Conclusion
From the analysis, it is clear that both operation 2 (Insert into S) and operation 3 (Delete from R) can cause a violation of the referential integrity constraint. Hence, the correct answer is option 'D' - Both 2 and 3 can cause its violation.
The referential integrity constraint is a rule that ensures the consistency and integrity of data between two related tables in a relational database. In this case, the constraint is between the tables R and S, where the foreign key d in S references the primary key of R.
Operations on R and S
1. Insert into R: When inserting a new record into R, the referential integrity constraint is not violated because there is no relationship between the new record and the existing records in S.
2. Insert into S: When inserting a new record into S, the foreign key value d must correspond to an existing primary key value in R. If the foreign key value d does not exist in R, the referential integrity constraint is violated.
3. Delete from R: When deleting a record from R, the referential integrity constraint is not violated because the corresponding records in S are not affected. However, if the deleted record in R is referenced by any record in S (through the foreign key d), the referential integrity constraint is violated.
4. Delete from S: When deleting a record from S, the referential integrity constraint is not violated because the primary key of R is not affected. However, if the deleted record in S is referenced by any record in R (through the foreign key d), the referential integrity constraint is violated.
Analysis of Operations
Based on the above operations, we can conclude the following:
- Operation 1 (Insert into R) does not violate the referential integrity constraint.
- Operation 2 (Insert into S) can violate the referential integrity constraint if the foreign key value does not exist in the referenced table (R).
- Operation 3 (Delete from R) can violate the referential integrity constraint if the deleted record in R is referenced by any record in S.
- Operation 4 (Delete from S) can violate the referential integrity constraint if the deleted record in S is referenced by any record in R.
Conclusion
From the analysis, it is clear that both operation 2 (Insert into S) and operation 3 (Delete from R) can cause a violation of the referential integrity constraint. Hence, the correct answer is option 'D' - Both 2 and 3 can cause its violation.
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Let R(a, b, c) and S(d, e, f) be two relations in which d is the foreign key of S that refers to the primary key of R. Consider the following four operations R and S1. Insert into R2. Insert into S3. Delete from R4. Delete from SWhich of the following is true about the referential integrity constraint above?a)None of 1, 2, 3 or 4 can cause its violationb)All of 1, 2, 3 and 4 can cause its violationc)Both 1 and 4 can cause its violationd)Both 2 and 3 can cause its violationCorrect answer is option 'D'. Can you explain this answer?
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Let R(a, b, c) and S(d, e, f) be two relations in which d is the foreign key of S that refers to the primary key of R. Consider the following four operations R and S1. Insert into R2. Insert into S3. Delete from R4. Delete from SWhich of the following is true about the referential integrity constraint above?a)None of 1, 2, 3 or 4 can cause its violationb)All of 1, 2, 3 and 4 can cause its violationc)Both 1 and 4 can cause its violationd)Both 2 and 3 can cause its violationCorrect answer is option 'D'. 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 Let R(a, b, c) and S(d, e, f) be two relations in which d is the foreign key of S that refers to the primary key of R. Consider the following four operations R and S1. Insert into R2. Insert into S3. Delete from R4. Delete from SWhich of the following is true about the referential integrity constraint above?a)None of 1, 2, 3 or 4 can cause its violationb)All of 1, 2, 3 and 4 can cause its violationc)Both 1 and 4 can cause its violationd)Both 2 and 3 can cause its violationCorrect answer is option 'D'. 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 Let R(a, b, c) and S(d, e, f) be two relations in which d is the foreign key of S that refers to the primary key of R. Consider the following four operations R and S1. Insert into R2. Insert into S3. Delete from R4. Delete from SWhich of the following is true about the referential integrity constraint above?a)None of 1, 2, 3 or 4 can cause its violationb)All of 1, 2, 3 and 4 can cause its violationc)Both 1 and 4 can cause its violationd)Both 2 and 3 can cause its violationCorrect answer is option 'D'. Can you explain this answer?.
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