\documentclass{article}
\usepackage[english]{babel}
\begin{document}
Without specifying width for last column:
\begin{center}
\begin{tabular}{| l | l | l | l |}
\hline
Day & Min Temp & Max Temp & Summary \\ \hline
Monday & 11C & 22C & A clear day with lots of sunshine. However, the strong breeze will bring down the temperatures. \\ \hline
Tuesday & 9C & 19C & Cloudy with rain, across many northern regions. Clear spells
across most of Scotland and Northern Ireland,
but rain reaching the far northwest. \\ \hline
Wednesday & 10C & 21C & Rain will still linger for the morning.
Conditions will improve by early afternoon and continue
throughout the evening. \\
\hline
\end{tabular}
\end{center}
\end{document}
I want to bold the line of the first row-column and last row-column. How to do this?

l(which is a one line cell) top{3cm}or whatever width you need. – David Carlisle Dec 17 '13 at 02:47