\begin{frame}
  \frametitle{Self Joins}
  
  \begin{goal}{}
    In some query scenarios, we might have to consider 
    \emph{more than one tuple of the same relation} 
    to generate a result tuple.
  \end{goal}
  \pause\bigskip
  
  \structureAll
  
  \begin{code}{\textwidth}{Is there a student with 9 points for both, homework 1 \& 2?}
    \pause
    \small
    \BUseVerbatim{query}
  \end{code}
\end{frame}