\begin{frame}
  \frametitle{Example Database (Exercises)}
  
  \begin{exampleblock}{}
    {\ttfamily
    \begin{center}
      \tableExercises
    \end{center}}
    \bigskip

    Meaning of the columns:
      \begin{description}\setlength{\itemindent}{.25cm}
      \item [\sql{category}:] homework, midterm or exam
      \item [\sql{number}:] exercise number within category
      \item [\sql{topic}:] topic of exercise
      \item [\sql{maxPoints}:] maximum number of points
      \end{description}
  \end{exampleblock}
\end{frame}