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?


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.


    x y
    1 2
    2 3
    3 4
    4 5

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

            is \\
            a column \\
            added \\
            before \\
            every head row/.style={before row=\toprule,after row=\midrule}

enter image description here

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