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\begin{frame}
  \frametitle{Example Database}
  
  \begin{exampleblock}{}
    {\ttfamily
    \begin{center}
      \tableexercises
    \end{center}}
    \bigskip

    \begin{itemize}
    \item Columns in table \sql{EXERCISES}: \\
      \begin{itemize}
      \item \sql{CAT}: category \\
        (\sql{H}: Homework, \sql{M}/\sql{F}: midterm/final exam)
      \item \sql{ENO}: exercise number within category
      \item \sql{TOPIC}: topic of exercise
      \item \sql{MAXPT}: maximum number of points
      \end{itemize}
    \end{itemize}
  \end{exampleblock}
\end{frame}