Databases · Integrity Constraints and Normal Forms
Official IIT answer key · IIT Delhi · Audited Aug 2026
GATE CSE 2012 Q43 · MCQ · 2 marks
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Topic notes
In GATE, Normal Forms questions test a candidate's ability to identify candidate keys, classify relational schemas into appropriate normal forms (such as 3NF and BCNF), and evaluate decomposition properties (lossless join and dependency preservation). Questions combine normal form verification with decomposition analysis, frequently formatted as multi-select questions (MSQs) requiring rigorous evaluation of all properties across both the original and decomposed relations.
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Suppose R1(A, B) and R2( C, D) are two relation schemas. Let r1 and r2 be the corresponding relation instances. B is a foreign key that refers to C in R2. If data in r1 and r2 satisfy referential integrity constraints, which of the following is ALWAYS TRUE?
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