95/296
\begin{frame}
  \frametitle{How to Determine Keys}

  \begin{quiz}{\textwidth}{Finding all minimal keys}
    Find \emph{all} minimal keys the relation $\sql{R}$
    \begin{center}
      {\ttfamily\centering
        \colorbox{rellight}{%
          \begin{tabular}[t]{|r|r|r|r|r|}
            \multicolumn{5}{c}{R} \\ \hline
            \hd{A} & \hd{B} & \hd{C} & \hd{D} & \hd{E} \\
            \hline
          \end{tabular}%
        }}
    \end{center}
    with the functional dependencies
    \begin{align*}
      \sql{A}, \sql{D} &\to \sql{B},\sql{D} \\
      \sql{B}, \sql{D} &\to \sql{C} \\
      \sql{A} &\to \sql{E} \\
      \sql{C}, \sql{D}, \sql{E} &\to \sql{A}
    \end{align*}
    using the algorithm on the previous slide.
  \end{quiz}
\end{frame}