\begin{frame}
  \frametitle{Representing Entity Sets}

  \begin{goal}{}
    A \emph{strong entity set} becomes \mpause[1]{a table with 
    \begin{itemize}
      \item columns for the attributes
    \end{itemize}
    }
  \end{goal}
  \smallskip
 
  \begin{center}
  \scalebox{.92}{
  \begin{tikzpicture}[every edge/.style={link}]
    \node[entity] (customer) {customer};
    \node[attribute] (id) [above left of=customer,node distance=1.7cm,shift={(-2mm,-3mm)}] {\key{id}} edge (customer);
    \node[attribute] (name) [above of=customer,node distance=1.3cm] {name} edge (customer);
    \node[attribute] (street) [left of=customer,node distance=2.1cm] {street} edge (customer);
    \node[attribute] (city) [below left of=customer,node distance=1.7cm] {city} edge (customer);
  \end{tikzpicture}
  }  
  \end{center}
  
  \mpause{
  \centering{\small\ttfamily
    \colorbox{rellight}{%
      \begin{tabular}[t]{|r|r|r|r|}
        \multicolumn{4}{c}{Customer}        \\ \hline
        \hd{\key{id}} & \hd{name} & \hd{street} & \hd{city} \\ \hline 
        1 & Smith & North & Pittsburgh  \\
        2 & Jones & Alma & Philadelphia \\
        3 & Brown & Main & New York     \\
        4 & Ford  & Main & Washington   \\
        \hline
      \end{tabular}%
    }}
    }
\end{frame}