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\begin{frame}
  \frametitle{Example Database (Students)}
  
  \begin{exampleblock}{}
    {\ttfamily
    \begin{center}
      \tablestudent
    \end{center}}
    \bigskip
    
    \begin{itemize}
    \item Columns in table \sql{STUDENTS}:
      \begin{itemize}
      \item \sql{SID}: ``student ID'' (unique number) 
      \item \sql{FIRST}, \sql{LAST}: first and last name 
      \item \sql{EMAIL}: email address (may be null)
      \end{itemize}
    \end{itemize}
  \end{exampleblock}
\end{frame}