Q:

How to make enough space in empty column?

As I am trying to make a simple table in Latex, I realize the empty column that I created has a really small width. Is there a way that I can increase the space in empty column?

A:

Create a single-column tabular, and specify the width of the space between the right-side double-line:

\documentclass{article}

\begin{document}

\begin{tabular}{|l|@{\hspace{1em}}|}
  \hline
  A \\
  \hline
  B \\
  \hline
\end{tabular}

\begin{tabular}{|l|@{\hspace{2em}}|}
  \hline
  A \\
  \hline
  B \\
  \hline
\end{tabular}

\end{document}

