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ISRO CSE 2014 | Question: 42

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Let $x,y,z,a,b,c$ be the attributes of an entity set E. If $\{x\} ,\{x,y\}, \{a,b\},\{a,b,c\}, \{x,y,z\}$ are superkeys then which of the following are the candidate keys?

  1. $\{x,y\}$ and $\{a,b\}$
  2. $\{x\}$ and $\{a,b\}$
  3. $\{x,y,z\}$ and $\{a,b,c\}$
  4. $\{z\}$ and $\{c\}$

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