figure-department-select-name-etc.tex

\begin{figure}
    \centering
    \begin{forest}
        unfolded database
        [,void
            [$\Department$,map,plural
                [$\Name$,map,singular]
                [$\TopSalary$,map,optional]
                [$\Manager$,map,plural
                    [$\Name$,map,singular],
                    [$\Salary$,map,singular]]]]
    \end{forest}
    \caption{Output database for Example~\ref{ex:department-select-name-etc}}
    \label{fig:department-select-name-etc}
\end{figure}