\begin{frame} \frametitle{Representing Relationship Sets} \begin{goal}{} A many-to-many \emph{relationship set} becomes \mpause[1]{a table with \begin{itemize} \item columns for the attributes of the relationship set, and \item for the primary keys of the participating entity sets. \end{itemize} } \end{goal} \medskip \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); \node[entity,right of=customer, node distance=6cm] (loan) {loan}; \node[attribute] (loan-number) [above of=loan,node distance=1.2cm] {\key{loan-number}} edge (loan); \node[attribute] (amount) [below right of=loan,node distance=1.7cm,xshift=-5mm] {amount} edge (loan); \node[relationship] (does) at ($(customer)!.5!(loan)$) {borrower} edge node [above,pos=.6] {1\sldots N} (customer) edge node [above,pos=.6] {0\sldots M} (loan); \end{tikzpicture}} \end{center} \mpause{ \centering{\small\ttfamily \colorbox{rellight}{% \begin{tabular}[t]{|r|r|} \multicolumn{2}{c}{Borrower} \\ \hline \hd{\key{id}$\;\to\;$Customer} & \hd{\key{loan-number}$\;\to\;$Loan} \\ \hline 12-0202 & L-11 \\ 01-1823 & L-14 \\ 22-7361 & L-17 \\ 05-1912 & L-20 \\ \hline \end{tabular}% }} } \end{frame}