\begin{frame}
  \frametitle{Simple Aggregations}

  \begin{goal}{}
    SQL also allows to write formulas
  \end{goal}
  \bigskip
    
  \begin{code}{\textwidth}{%
      What average percentage of the maximum points did the students
      reach for homework 1?
    }
    \small
    \BUseVerbatim{avg}
  \end{code}
  \pause
  \smallskip
  
  \begin{code}{\textwidth}{%
      Homework points for student 101 plus 3 bonus points.
    }\pause
    \small
    \BUseVerbatim{bonus}
  \end{code}
\end{frame}