\begin{frame}
  \frametitle{Functional Dependencies}

  \begin{exampleblock}{}
  \begin{center}
    \tableCourses
  \end{center}
  \end{exampleblock}
  \bigskip
  
  \begin{goal}{}
    A \emph{functional dependency (FD)} in this table is
    \begin{talign}
      \sql{instructor} \to \sql{phone}
    \end{talign}
    Whenever two rows agree in the instructor name, they \emph{must} also agree in the phone number!
  \end{goal}
  \pause

  Intuitively, this is a FD 
  since the phone number \emph{only depends on the instructor}, not on the other attributes.
\end{frame}