% This file is embedded in datatool-user.pdf version 3.1 2025-03-10
% Example 90 Displaying Data with Row Numbers Using \DTLforeach
% Label: "ex:foreachinsertcol"
% arara: pdflatex
% arara: pdflatex
% arara: pdfcrop
\documentclass[12pt]{article}
\pagestyle{empty}
 \begin{filecontents}[noheader,overwrite]{studentmarks.csv}
Surname,Forename,StudentNo,Assign1,Assign2,Assign3
"Smith, Jr",John,102689,68,57,72
"Brown",Jane,102647,75,84,80
"Brown",Jane,102646,64,92,79
"Brown",Andy,103569,42,52,54
"Adams",Zoë,105987,52,48,57
"Brady",Roger,106872,68,60,62
"Verdon",Clare,104356,45,50,48
\end{filecontents}

\usepackage{datatool}
\DTLsetup{default-name=marks}
\DTLread{studentmarks.csv}

\begin{document}
\begin{tabular}{rllrrrr}
\bfseries Row &
\bfseries Surname &
\bfseries Forename &
\bfseries StudentNo &
\bfseries Assign1 &
\bfseries Assign2 &
\bfseries Assign3% 
\DTLforeach*{marks}
{\Surname=Surname, \Forename=Forename, \StudentNo=StudentNo,
\AssignI=Assign1, \AssignII=Assign2, \AssignIII=Assign3}
{% 
 \label{\StudentNo}
 \\ \theDTLrowi &
 \Surname &
 \Forename &
 \StudentNo &
 \AssignI &
 \AssignII &
 \AssignIII
}% 
\end{tabular} 

\DTLaction[
 assign={
  \Surname=Surname,
  \Forename=Forename,
  \StudentNo=StudentNo
 },
 options={
  inline={% 
  \DTLifstringeq{\Surname}{Brown}
  {\DTLifstringeq{\Forename}{Andy}{#1}{}}{}% 
  }
 }
]{find}
Row \ref{\StudentNo} shows the details for Andy Brown. 
\end{document}