GATE CSE 2024 Session 1 Q44: Valid inferences of functional dependencies

The symbol $\to$ indicates functional dependency in the context of a relational database. Which of the following options is/are TRUE?

Try it: multiple select: one or more correct options

Select all correct options. No negative marking, no partial marks.

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Answer: B, C, D (official GATE 2024 final answer key)

Concept used: Armstrong's axioms: decomposition, pseudo-transitivity and transitivity are sound; shrinking the left side is not.

First step: Check each option against a known rule; for (A), look for a relation where $X$ alone does not fix $Z$ .

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Source: official GATE 2024 Session 1 CS question paper and final answer key, organised by IISc Bangalore. Question paper · Answer key