Computer Science Engineering (CSE) Exam  >  Computer Science Engineering (CSE) Questions  >  Let R (a, b,c) and S (d, e, f) be two relatio... Start Learning for Free
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.
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 about?
  • a)
    None of them can cause any violation
  • b)
    All of them can cause violation
  • c)
    Operations (1) and (4) can cause violation
  • d)
    Operations (2) and (3) can cause violation
Correct answer is option 'D'. Can you explain this answer?
Verified Answer
Let R (a, b,c) and S (d, e, f) be two relations in which d is the fore...
R (a, b, d, c) and S (e,f)
1. Insertion into R does not create any violation,
2. Insertion into S create violation.
3. Deletion in S does not create any violation.
4. Deletion in R can create violation.
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Most Upvoted Answer
Let R (a, b,c) and S (d, e, f) be two relations in which d is the fore...
Referential Integrity Constraint

Referential integrity constraint is a database constraint that ensures that the relationship between two tables is maintained correctly. It ensures that the foreign key in a table refers to the primary key in another table.

Given that R (a, b,c) and S (d, e, f) are two relations in which d is the foreign key of S that refers to the primary key of R, let's consider the four operations and their effect on the referential integrity constraint.

1. Insert into R

When a new record is inserted into R, it does not affect the referential integrity constraint as long as the value of the primary key is not already present in R. If the primary key value is already present in R, then inserting a new record will result in a violation of the referential integrity constraint.

2. Insert into S

When a new record is inserted into S, the value of the foreign key (d) must match a value of the primary key in R. If the value of the foreign key does not exist in the primary key of R, then inserting a new record will result in a violation of the referential integrity constraint.

3. Delete from R

When a record is deleted from R, any records in S that have a foreign key value (d) that matches the primary key value in the deleted record will be affected. If there are no records in S with a matching foreign key value, then the referential integrity constraint is not violated. However, if there are records in S with a matching foreign key value, then deleting the record from R will result in a violation of the referential integrity constraint.

4. Delete from S

When a record is deleted from S, it does not affect the referential integrity constraint as long as there are no records in S with the same foreign key value. If there are records in S with the same foreign key value, then deleting the record from S will result in a violation of the referential integrity constraint.

Conclusion

Based on the above analysis, it is clear that operations (2) and (3) can cause a violation of the referential integrity constraint. Therefore, the correct answer is option 'D'.
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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.1. Insert into R2. Insert into S3. Delete from R4. Delete from SWhich of the following is true about the referential integrity constraint about?a)None of them can cause any violationb)All of them can cause violationc)Operations (1) and (4) can cause violationd)Operations (2) and (3) can cause violationCorrect answer is option 'D'. Can you explain this answer?
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