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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. I. Insert into R II. Insert into S III. Delete from R IV. Delete from S Which of the following can cause violation of the referential integrity constraint above?
  • a)
    Both I and IV
  • b)
    Both II and III
  • c)
    All of these
  • d)
    None of these
Correct answer is option 'B'. 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 forei...
II and III statement can cause the violation of the referential integrity constraint as d is the foreign key of S that refers to the primary key of R. So, d should always be a subset of primary key of R. But insertion to S and deletion from R may cause the violation of subset property as after these operations d may contain a value that is not present in the primary key of A. So, option (B) is correct.
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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. I. Insert into R II. Insert into S III. Delete from R IV. Delete from S Which of the following can cause violation of the referential integrity constraint above?a)Both I and IVb)Both II and IIIc)All of thesed)None of theseCorrect answer is option 'B'. Can you explain this answer?
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