\begin{frame}
  \frametitle{Motivation for Database Management Systems}
  
  \begin{goal}{Motivation for database management systems}
    \begin{itemize}
    \medskip
      \item high-level \emph{declarative query languages}
      \begin{itemize}
        \item query tells what you want, independent of storage structure 
        \item efficient data access (automatic query optimisation)
      \end{itemize}
    \medskip
    \end{itemize}
  \end{goal}
  \bigskip
  
  Declarative query languages:
    \begin{itemize}
      \item describe \emph{what} information is sought
      \item \emph{not} prescribe \emph{how} to retrieve the desired information 
    \end{itemize}
\end{frame}