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\begin{frame}
  \frametitle{Unnecessary Joins}
  
  \begin{exampleblock}{}
    \begin{tcenter}
    \scalebox{.9}{
    \parbox[t]{0.55\linewidth}{
      \tableexercises
    }\quad
    \parbox[t]{0.45\linewidth}{%
      \tableresults
    }}
    \end{tcenter}
  \end{exampleblock}
  \smallskip

  \begin{quiz}{\textwidth}{What will be the result of this query?}
    \small
    \BUseVerbatim{xproduct}
  \end{quiz}
  %% Note: cross product between RESULTS and EXERCISES
\end{frame}