\begin{frame}
  \frametitle{Common Errors}
  
  \begin{quiz}{\textwidth}{Does this query compute the student with the best result for homework 1?}
    {\small
      \BUseVerbatim{query}
  
    }
    \bigskip
    
    If not, what does the query compute?
  \end{quiz}

  %% Return those Students who got more points in homework 1 than _some_
  %% other student.
  %% (This is monotonic.)
\end{frame}