How to position number above specific column on a table

Question

I am trying to display a number outside of a table next to a certain cell. In this example I want the 2 to be above the 3rd column. Right now I am making two separate tables with the first one not having a border, but the 2 is too high above the table. I attached a picture of what I currently have and this is the code I am using as of now. What is the easiest way to achieve this?

begin{table}[htb!]
centering
begin{tabular}{c c c}
     &  & 2 
end{tabular}
end{table}

begin{table}[htb!]
centering
begin{tabular}{|c|c|c|}
hline
 & 1 &  
hline
 &  &  
hline
 &  &  
hline
end{tabular}
caption{3$times$3 Magic Square}
label{tab:my_label}
end{table}

Roland · Accepted Answer

What about making a bigger table partialy with visible borders:
documentclass{article}

begin{document}
    renewcommand{arraystretch}{1.5}
    begin{table}[]
        centering
        begin{tabular}{lllll}
            & 1                      & 2                      & 3                      &    cline{2-4}
            multicolumn{1}{l|}{12} & multicolumn{1}{l|}{A} & multicolumn{1}{l|}{B} & multicolumn{1}{l|}{C} & 4  cline{2-4}
            multicolumn{1}{l|}{11} & multicolumn{1}{l|}{D} & multicolumn{1}{l|}{E} & multicolumn{1}{l|}{F} & 5  cline{2-4}
            multicolumn{1}{l|}{10} & multicolumn{1}{l|}{G} & multicolumn{1}{l|}{H} & multicolumn{1}{l|}{I} & 6  cline{2-4}
            & 9                      & 8                      & 7                      &  
        end{tabular}
        caption{3x3 magic square}
        label{tab:my_label}
    end{table}
    
end{document}

Zarko · Answer

Welcome to TEX.SE! You should be more specific about distance between number "outside" of table and table.
One possible solution is:
documentclass{article}
NewExpandableDocumentCommandmcc{O{1}m}
    {multicolumn{#1}{c}{#2}}
usepackage{array}

begin{document}
    begin{table}[htb!]
centering
renewcommandarraystretch{1.6}
begin{tabular}{|*{3}{w{c}{1em}|} }
mcc[2]{}   & mcc{2}   [1ex]
    hline
hphantom{3}
            &   1   &   
hline
            &       &   
hline
            &       &  
hline
end{tabular}
    caption{3$times$3 Magic Square}
label{tab:my_label}
    end{table}
end{document}

Another possible solution is use of the blkarray package:
documentclass{article}
NewExpandableDocumentCommandmcc{O{1}m}
    {multicolumn{#1}{c}{#2}}
usepackage{blkarray, bigstrut}

begin{document}
begin{table}
  [
begin{blockarray}{ccc}
    &   & 2 bigstrut[b]    
begin{block}{|c|c|c|}
hline
hphantom{3}
    & 1 &       
hline
    &   &       
hline
    &   &       
hline
    end{block}
end{blockarray}
]
    caption{3$times$3 Magic Square as array}
label{tab:my_label}
    end{table}
end{document}

js bibra · Answer

documentclass{article}

usepackage{nicematrix}
usepackage{tikz}
usetikzlibrary{calc}
begin{document}
    
    begin{NiceTabular}{|c|c|}
        hline
        A & B 
        hline
        C & D 
        hline
    end{NiceTabular}

bigskip
    begin{NiceTabular}{|c|c|c|}[code-after=%
        tikz draw($(row-1-|col-2)!0.5!(row-1-|col-3)$) node[above,]{2} ;]
        hline
        A & B & C hline
        E & F & G hline
        H & I & J
        hline
    end{NiceTabular}
    
end{document}

F. Pantigny · Answer

With {NiceTabular} of nicematrix, it's easy.
documentclass{article}
usepackage{nicematrix}
begin{document}

begin{NiceTabular}{ccc}[hvlines,first-row]
  & 2 & 
A & B & C 
D & E & F 
G & H & I
end{NiceTabular}

end{document}

How to position number above specific column on a table

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