如何让一列跨越表格宽度的一半

Question 1

要解决您的问题，您需要知道表格的最终宽度。由于事先不知道，因此很难将最后一行分成两个相等的部分。

在“反复试验”的基础上，我成功获得以下结果：

对于这张图片，我在表格代码的末尾添加了：

%%%%%%%%%%%%%%%%%%% Part with two columns (nested) %%%%%%%%%%
   \multicolumn{8}{@{}c@{}}{
        \begin{tabular}{|*{2}{p{68mm}|}}% <-- width of columns is guessed
            &   \\
        \end{tabular}
                        }       \\
   \hline
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  \end{tabular}
\end{sidewaystable*}    
    \end{document}

升级： 通过测量表格的实际宽度可以避免猜测表格的宽度。为此，我添加了新的长度tablewidth和新的保存框tablebox。程序的思路如下：- 将原始表格存储在\tablebox - 测量保存框的宽度 - 打印保存框 - 添加表格（即：新表格的最后一行），其中一列的宽度计算为0.5\tablewidth-2\tabcolsep-9\arrayrulewidth

完整代码为：

\documentclass{article}
\usepackage[utf8]{inputenc}
\usepackage{rotating}
\usepackage{multirow,tabularx}
\usepackage{calc}

\newsavebox\tablebox
\newlength\tablewidth
    \begin{document}
\begin{sidewaystable*}
  \centering\small
  \renewcommand{\arraystretch}{1.4}

\savebox\tablebox{
  \begin{tabular}{|*{8}{c|}}
  \hline
    \multicolumn{8}{|c|}{\textbf{ANALYSE DE RISQUE}}\\
  \hline
    \multicolumn{8}{|c|}{\textbf{Poste de travail ou machine:}}\\
  \hline
    \multicolumn{4}{|c|}{\textbf{Risque}} & \textbf{Indice} &  \textbf{Situation Dangereuse} &  \textbf{Conséquence} &  \textbf{Mesure Corrective}\\
   \hline
%%%%%%%%%%%%%%%%%%% Part to duplicate if needed %%%%%%%%%%%
   \multicolumn{4}{|c|}{} & \multirow{ 2}{*}{} &  \multirow{ 2}{*}{} &  \multirow{ 2}{*}{} &   \multirow{ 2}{*}{}\\
   \cline{1-4}
   G: & F: & O: & P: & & & & \\
   \hline
%%%%%%%%%%%%%%%%%%% Part to duplicate if needed %%%%%%%%%%%
   \multicolumn{4}{|c|}{} & \multirow{ 2}{*}{} &  \multirow{ 2}{*}{} &  \multirow{ 2}{*}{} &   \multirow{ 2}{*}{}\\
   \cline{1-4}
   G: & F: & O: & P: & & & & \\
   \hline
%%%%%%%%%%%%%%%%%%% Part to duplicate if needed %%%%%%%%%%%
   \multicolumn{4}{|c|}{} & \multirow{ 2}{*}{} &  \multirow{ 2}{*}{} &  \multirow{ 2}{*}{} &   \multirow{ 2}{*}{}\\
   \cline{1-4}
   G: & F: & O: & P: & & & & \\
   \hline
%%%%%%%%%%%%%%%%%%% Part to duplicate if needed %%%%%%%%%%%
   \multicolumn{4}{|c|}{} & \multirow{ 2}{*}{} &  \multirow{ 2}{*}{} &  \multirow{ 2}{*}{} &   \multirow{ 2}{*}{}\\
   \cline{1-4}
   G: & F: & O: & P: & & & & \\
   \hline
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  \end{tabular}
}
\usebox\tablebox

%%%%%%%%%%%%%%%%%%% Part with two columns (nested) %%%%%%%%%%
\settowidth\tablewidth{\usebox\tablebox}
    \vspace{-3\arrayrulewidth}
        \begin{tabular}{|*{2}{p{0.5\tablewidth-2\tabcolsep-9\arrayrulewidth}|}}
            &   \\
        \hline
        \end{tabular}
\end{sidewaystable*}    
    \end{document}

得到的表格与通过猜测得到的表格形式相同，但是现在不再需要猜测，最后一行的列宽将根据其之前的表格的实际宽度计算。

Answer