(n) _____ exists when there are functional dependencies such that XY is functionally dependent on WZ, X is functionally dependent on W, and XY is the primary key. atomic attribute repeating group partial dependency transitive dependency
Added by Richard D.
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- **Atomic attribute**: An attribute that cannot be divided into smaller parts. - **Repeating group**: A set of attributes that can have multiple values for a single entity. - **Partial dependency**: A situation in a database where a non-key attribute is Show more…
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Consider the following schema $A=(w, x, y, z)$ and the dependencies are $W \rightarrow X, X \rightarrow Y, Y \rightarrow Z$, and $Z \rightarrow W$ Let $A=\left(A_{1}\right.$ and $A_{2}$ ) be a decomposition such that $A_{1} \cap A_{2}=\phi$ The decomposition is (A) In $1 \mathrm{NF}$ and in $2 \mathrm{NF}$ (B) In $2 \mathrm{NF}$ and not in $3 \mathrm{NF}$ (C) In $2 \mathrm{NF}$ and in $3 \mathrm{NF}$ (D) Not in $2 \mathrm{NF}$ and in $3 \mathrm{NF}$
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Consider the following relational instance: $$ \begin{array}{lll} \hline \boldsymbol{X} & \boldsymbol{Y} & \boldsymbol{Z} \\ \hline 1 & 4 & 2 \\ 1 & 5 & 3 \\ 1 & 6 & 3 \\ 3 & 2 & 2 \\ \hline \end{array} $$ Which of the following functional dependencies are satisfied by the instance? (A) $x y \rightarrow z$ and $z \rightarrow y$ (B) $y z \rightarrow x$ and $y \rightarrow z$ (C) $y z \rightarrow x$ and $x \rightarrow z$ (D) $x z \rightarrow y$ and $y \rightarrow x$
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