\begin{frame}[t] \frametitle{Exercise} \structureAll \medskip \begin{quiz}{0.95\textwidth}{Formulate the following query in SQL} The topics of all exercises solved by George Orwell? \end{quiz} \pause\bigskip We need tuple variables for \sql{Students} and \sql{Exercises}. \begin{tcenter} \begin{code}{\textwidth}{} \small \BUseVerbatim{query} \end{code} \end{tcenter} \pause\medskip \begin{alertblock}{} \emph{Problem}: \sql{S} and \sql{E} are \emph{unconnected}! \end{alertblock} \end{frame}