\begin{tabular}{l|>{\centering}p{0.11\linewidth}||>{\centering}p{0.11\linewidth}||>{\centering}p{0.11\linewidth}|c}
a & b & c \tabularnewline
\hline
a & b & c & d & e & f & g \tabularnewline
\end{tabular}
\begin{longtable}{l|>{\centering}p{0.11\linewidth}||>{\centering}p{0.11\linewidth}||>{\centering}p{0.11\linewidth}|c}
a & b & c \tabularnewline
\hline
a & b & c & d & e & f & g \tabularnewline
\end{longtable}