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\begin{frame}
  \frametitle{Example Database}
  
  \begin{exampleblock}{}
    {\ttfamily\footnotesize
    \parbox[t]{0.55\linewidth}{
      \tablestudent
      \bigskip
      
      \tableexercises
    }
    \parbox[t]{0.35\linewidth}{%
      \tableresults
    }}
    \bigskip
    
    \begin{itemize}
    \item Columns in table \sql{RESULTS}: \\
      \begin{itemize}
      \item \sql{SID}: student who did the exercise 
        (\hint{references \sql{STUDENTS}})
      \item \sql{CAT}, \sql{ENO}: identification of exercise
         (\hint{references \sql{EXERCISE}})
      \item \sql{POINTS}: graded points
      \end{itemize}
    \end{itemize}
  \end{exampleblock}
\end{frame}