Tabularx multicolumn

Question

Hello this is my table:

\documentclass[12pt, oneside,titlepage]{book} % add a4paper
\usepackage[italian]{babel}
\usepackage{geometry}
%\geometry{a4paper, top = 2cm, right = 2cm, left = 2cm, bottom = 2cm}
% Tabelle
\usepackage[usenames,dvipsnames]{xcolor}
\usepackage{tcolorbox}
\usepackage{tabularx}
\usepackage{array}
\usepackage{colortbl}
\tcbuselibrary{skins}
\newcolumntype{Y}{>{\raggedleft\arraybackslash}X}
\tcbset{tab1/.style={fonttitle=\bfseries\large,fontupper=\normalsize\sffamily,
        colback=yellow!10!white,colframe=red!75!black,colbacktitle=Salmon!40!white,
        coltitle=black,center title,freelance,frame code={
            \foreach \n in {north east,north west,south east,south west}
            {\path [fill=red!75!black] (interior.\n) circle (3mm); };},}}
\tcbset{tab2/.style={enhanced,fonttitle=\bfseries,fontupper=\normalsize\sffamily,
        colback=yellow!10!white,colframe=red!50!black,colbacktitle=Salmon!40!white,
        coltitle=black,center title}}
\begin{document}
    \begin{tcolorbox}[tab2,tabularx={X|Y|Y|Y},title=Viste materializzate,boxrule=0.5pt] 
    Nome vista & Tempo (s) & Dimensione & Guadagno \ \hline \hline
A &amp; 0.2 &amp; 16 kB &amp; 0 \%\\ \hline
B &amp; 10 &amp; 4336 kB &amp; 1 \% \\ \hline


\end{tcolorbox}
\end{document}

But I would like to get the template similar to this, that is with "Senza vista" node and "senza indici" and "con indici" children and so on. How can I do?

Welcome to TSE. Please post a Minimal Working Example, instead of a code snippet. — José Carlos Santos, May 14 '22 at 15:09
Maybe like this https://tex.stackexchange.com/a/131868/263192 ? — , May 14 '22 at 17:56
Merge B and C in a A & B & C & D .... table row is simply changing the row to A & \multicolumn{2}{c|}{BC} & D ... To avoid draw the line under " Semestre", change the \hline after first row to \cline{2-4}. For backgrounds, use \rowcolor{gray} Semestre & ... or ... & \cellcolor{red} Senza indici & ... — Fran, May 15 '22 at 14:18

score 3 · Accepted Answer · answered May 16 '22 at 13:29

With {NiceTabular} of nicematrix :

\documentclass{article}
\usepackage{nicematrix}
\begin{document}
\sffamily
\begin{NiceTabular}{ccccc}[hvlines]
\RowStyle[color=white,rowcolor=black]{}
Semestre & \Block{1-2}{Senza Vista} && \Block{1-2}{Con Vista} \
\RowStyle[rowcolor=black]{}
         & \RowStyle[color=white,rowcolor=gray]{}
           Senza Indici & Con Indici & Senza Indici & Con Indici \
1 & 284.9 ms & 119.6 ms & 44.7 ms & 1.8 ms \
2 & 636.66 ms & 137.4 ms & 45.4 ms & 3.88 ms \
3 & 962.7 ms & 157 ms & 55.7 ms & 4.6 ms \
4 & 1340 ms & 190.2 ms & 87.6 ms & 6.5 ms 
\end{NiceTabular}
\end{document}

You need several compilations (because nicematrix uses PGF/Tikz nodes under the hood).

The name of that command is \RowStyle and not \Rowstyle but, if the command \RowStyle is not accepted, your version of nicematrix is probably too old. You need at least version 6.3 of 2022/10/18. — F. Pantigny, May 16 '22 at 16:20

score 1 · Answer 2 · answered May 16 '22 at 16:40

With tblr of tabularray and by use S column type for columns with numbers (that they are aligned at the decimal point):

\documentclass{article}
\usepackage{xcolor}
\usepackage{tabularray}
\UseTblrLibrary{siunitx}
\begin{document}
    \begin{table}[ht]
\sisetup{round-mode = places,
         round-precision = 2}
    \begin{tblr}{hlines, vlines,
                colspec = {c S[table-format=4.2{ms}]
                             S[table-format=3.2{ms}]
                             S[table-format=2.2{ms}]
                             S[table-format=1.2{ms}]
                          },
                 row{1} = {bg=black, fg=white},
                 row{2} = {bg=gray,  fg=white},
                 }
\SetCell[r=2]{h, bg=black}   {{{Semestre}}}
    &  \SetCell[c=2]{c} {{{Senza Vista}}}
            &       &   \SetCell[c=2]{c} {{{Con Vista}}}
                                            &           \
    & {{{Senza Indici}}}
            & {{{Con Indici}}}
                    & {{{Senza Indici}}}
                            & {{{Con Indici}}}          \
1   & 284.9 ,ms    & 119.6 ,ms    & 44.7 ,ms & 1.8  ,ms \
2   & 636.66,ms    & 137.4 ,ms    & 45.4 ,ms & 3.88 ,ms \
3   & 962.7 ,ms    & 157   ,ms    & 55.7 ,ms & 4.6  ,ms \
4   & 1340  ,ms    & 190.2 ,ms    & 87.6 ,ms & 6.5  ,ms
    \end{tblr}
    \end{table}
\end{document}

It need only one compilation for final result:

Tabularx multicolumn

2 Answers2