Display table nicely and better code

Question

I have this code for a table...

\documentclass[11pt,a4paper]{article}
\usepackage[margin=20mm]{geometry}
\usepackage{rotating}
\usepackage{float}
\newcommand*\rot[1]{\rotatebox{90}{#1}}
\usepackage{tabularx}
\renewcommand{\arraystretch}{1.5}
\begin{document}
\begin{table}[H]
  \begin{tabularx}{\textwidth}{|XXXXXXXXXXXX|}
  \hline
  \multicolumn{3}{|X|}{Design Table for: Coursework Candidate\_Name} &  &  &  &  &  &  &  &  &  \\
  \hline
  \multicolumn{1}{|X|}{} & \multicolumn{1}{X|}{Shaft Diameter} & \multicolumn{1}{X|}{Max Torque} & 
  \multicolumn{1}{X|}{Outer Flange Diameter} & \multicolumn{1}{X|}{Flange Base Depth} & \multicolumn{1}{X|}{Inner Flange Diameter} & \multicolumn{1}{X|}{Flange Boss Depth} & \multicolumn{1}{X|}{Pitch Centre Diameter} & \multicolumn{1}{X|}{Number of Holes} & \multicolumn{1}{X|}{Hole Diameter} & \multicolumn{1}{X|}{Key Way Width} & \multicolumn{1}{X|}{Key Way Depth} \\
  \hline
  \multicolumn{1}{|l|}{} & \multicolumn{1}{l|}{\rot{D1@Sketch4}} & \multicolumn{1}{l|}{} & 
  \multicolumn{1}{l|}{\rot{D1@Sketch1}} & \multicolumn{1}{l|}{\rot{D1@Boss-Extrude1}} & 
  \multicolumn{1}{l|}{\rot{D1@Sketch2}} & \multicolumn{1}{l|}{\rot{D1@Boss-Extrude2}} & 
  \multicolumn{1}{l|}{\rot{D1@Sketch3}} & \multicolumn{1}{l|}{\rot{D2@Sketch3}} & \multicolumn{1}{l|}{\rot{D3@Sketch3}} & \multicolumn{1}{l|}{\rot{D2@Sketch4}} & \multicolumn{1}{l|}{\rot{D3@Sketch4}} \\
  \hline
  \multicolumn{1}{|l|}{Default} & \multicolumn{1}{l|}{55} & \multicolumn{1}{l|}{240} & \multicolumn{1}{l|}{220} & \multicolumn{1}{l|}{27.5} & \multicolumn{1}{l|}{110} & \multicolumn{1}{l|}{27.5} & \multicolumn{1}{l|}{82.5} & \multicolumn{1}{l|}{9} & \multicolumn{1}{l|}{20} & \multicolumn{1}{l|}{6.875} & \multicolumn{1}{l|}{13.75} \\
  \hline
  \multicolumn{1}{|l|}{132M} & \multicolumn{1}{l|}{55} & \multicolumn{1}{l|}{240} & \multicolumn{1}{l|}{220} & \multicolumn{1}{l|}{27.5} & \multicolumn{1}{l|}{110} & \multicolumn{1}{l|}{27.5} & \multicolumn{1}{l|}{82.5} & \multicolumn{1}{l|}{9} & \multicolumn{1}{l|}{20} & \multicolumn{1}{l|}{6.875} & \multicolumn{1}{l|}{13.75} \\
  \hline
  \multicolumn{1}{|l|}{100L} & \multicolumn{1}{l|}{38} & \multicolumn{1}{l|}{135} & \multicolumn{1}{l|}{152} & \multicolumn{1}{l|}{19} & \multicolumn{1}{l|}{76} & \multicolumn{1}{l|}{19} & \multicolumn{1}{l|}{57} & \multicolumn{1}{l|}{6} & \multicolumn{1}{l|}{20} & \multicolumn{1}{l|}{4.75} & \multicolumn{1}{l|}{9.5} \\
  \hline
  \multicolumn{1}{|l|}{80L} & \multicolumn{1}{l|}{24} & \multicolumn{1}{l|}{24} & \multicolumn{1}{l|}{96} & \multicolumn{1}{l|}{12} & \multicolumn{1}{l|}{48} & \multicolumn{1}{l|}{12} & \multicolumn{1}{l|}{36} & \multicolumn{1}{l|}{6} & \multicolumn{1}{l|}{8} & \multicolumn{1}{l|}{3} & \multicolumn{1}{l|}{6} \\
  \hline
  \multicolumn{1}{|l|}{63S} & \multicolumn{1}{l|}{11} & \multicolumn{1}{l|}{10} & \multicolumn{1}{l|}{44} & \multicolumn{1}{l|}{5.5} & \multicolumn{1}{l|}{22} & \multicolumn{1}{l|}{5.5} & \multicolumn{1}{l|}{16.5} & \multicolumn{1}{l|}{3} & \multicolumn{1}{l|}{8} & \multicolumn{1}{l|}{1.375} & \multicolumn{1}{l|}{2.75} \\
  \hline
  \end{tabularx}
\end{table}
\end{document}

I wanted to know whether the code for the table can be improved (I'm unfamiliar with LaTeX tables) and also if the part saying 'Design table...' can be displayed nicer and currently it wraps, but it is too much wrapping. Also is there a better way to display the second row content?

Answer 1

Here is an answer with the idea of "table notes" to avoid the second row of the table that looks ugly:

\documentclass[11pt,a4paper]{article}
\usepackage[margin=20mm]{geometry}
\usepackage{float}
\usepackage{rotating}
\usepackage{siunitx}
\newcommand*\rot[1]{\rotatebox{90}{#1}}
\def\fnsymbol#1{\ensuremath{\ifcase#1\or *\or \dagger\or \ddagger\or
   \mathsection\or \mathparagraph\or \|\or **\or \dagger\dagger
   \or \ddagger\ddagger \else\@ctrerr\fi}}
%\usepackage{tabularx}
\renewcommand{\arraystretch}{1.5}
\begin{document}
\begin{table}[H]
  \begin{tabular*}{\linewidth}{@{\extracolsep{\fill}}|c|S[table-format=2]|S[table-format=3]|S[table-format=3]|S[table-format=2.1]|S[table-format=3]||S[table-format=2.1]|S[table-format=2.1]|S[table-format=1]|S[table-format=2]|S[table-format=1.3]|S[table-format=2.2]|}
  \hline
  \multicolumn{3}{|c|}{\begin{tabular}{c}Design Table for:\\ Coursework Candidate\_Name\end{tabular}} &\multicolumn{9}{c|}{} \\
  \hline
   & \rot{Shaft Diameter} & \rot{Max Torque} & 
  \rot{Outer Flange Diameter} & \rot{Flange Base Depth} & \rot{Inner Flange Diameter} & \rot{Flange Boss Depth} & \rot{Pitch Centre Diameter} & \rot{Number of Holes} & \rot{Hole Diameter} & \rot{Key Way Width} & \rot{Key Way Depth} \\
  \hline
  & $\fnsymbol{1}$&  & 
  $\fnsymbol{2}$ & $\fnsymbol{3}$ & 
  $\fnsymbol{4}$ & $\fnsymbol{5}$ & 
  $\fnsymbol{6}$ & $\fnsymbol{6}$& $\fnsymbol{6}$ & $\fnsymbol{7}$ & $\fnsymbol{7}$ \\
  \hline
  Default & 55 & 240 & 220 & 27.5 & 110 & 27.5 & 82.5 & 9 & 20 & 6.875 & 13.75 \\
  \hline
  132M & 55 & 240 & 220 & 27.5 & 110 & 27.5 & 82.5 & 9 & 20 & 6.875 & 13.75 \\
  \hline
  100L & 38 & 135 & 152 & 19 & 76 & 19 & 57 & 6 & 20 & 4.75 & 9.5 \\
  \hline
  80L & 4 & 24 & 96 & 12 & 48 & 12 & 36& 6 & 8 & 3 & 6 \\
  \hline
  63S & 11 & 10& 44& 5.5 & 22 & 5.5 & 16.5 & 3 & 8 & 1.375 & 2.75 \\\hline
  \multicolumn{12}{|c|}{\begin{tabular}{@{}llll@{}}$\fnsymbol{1}$: D1@Sketch4 & $\fnsymbol{2}$: D1@Sketch1& $\fnsymbol{3}$: D1@Boss-Extrude1 & $\fnsymbol{4}$: D1@Sketch2 \\$\fnsymbol{5}$: D1@Boss-Extrude2 & $\fnsymbol{6}$: D1@Sketch3 & $\fnsymbol{7}$: D3@Sketch4& \end{tabular}}\\
  \hline
  \end{tabular*}
\end{table}

Test text here with length at least one full line in order to see if table takes over all the line width and goes to next line
\end{document}

Output: