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I know that I can create a new column via

create on use/newCol/.style={
    create col/set list={Some content, Some other content}
},
columns/newCol/.style={string type},
columns = {newCol, [index] 0, [index] 1, [index] 2, [index] 3},

That is all well but what if I don't know how many columns the table has in total?
Is there a way to simply (pre)append the new column to the existing ones without having to specify all other columns in the table?

1

Since you don't know the number of the columns, I presume you're reading a table from an external file.

In that case, you could simply add a normal one-column table before your pgfplotstable.

\documentclass{article}
\usepackage{pgfplotstable}
\usepackage{filecontents}
\usepackage{booktabs}

\begin{filecontents*}{\jobname.dat}
    x y
    1 2
    2 3
    3 4
    4 5
\end{filecontents*}

\pgfplotstableset{% global config, for example in the preamble
    every last row/.style={after row=\bottomrule}
}

\begin{document}
    \begin{table*}
        \begin{tabular}{c}
            \toprule
            This\\
            \midrule
            is \\
            a column \\
            added \\
            before \\
            \bottomrule
        \end{tabular}%
        \pgfplotstabletypeset[
            every head row/.style={before row=\toprule,after row=\midrule}
            ]{\jobname.dat}
    \end{table*}
\end{document}

enter image description here

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