\begin{frame}
  \frametitle{Preservation of Functional Dependencies}
  
  \begin{exampleblock}{}
    \exampleZip
    \bigskip
    
    Is the table in 3NF? \pause Yes
    \begin{itemize}
      \item Most designers would not split the table since it is in 3NF.
    \smallskip
      \item \emph{Pro split}: 
            if there are many addresses with the same ZIP code, there will be significant redundancy.
    \smallskip
      \item \emph{Contra split}: 
            queries will involve more joins.
    \end{itemize}
    \bigskip
    \pause
    
    Whether or not to split depends on the intended application:
    \begin{itemize}
      \item A table of ZIP codes might be of interest on its own.\\
        \remark{E.g. for the database of a mailing company.}
    \end{itemize}
  \end{exampleblock}
\end{frame}