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% This file is public domain.
\documentclass[captions=tableheading]{scrartcl}
\usepackage{tikz}
\usetikzlibrary{snakes}
\usepackage{databar}
\DTLloaddb{marks}{sample-student-records.csv}
\begin{document}
% Compute average mark for each student:
\DTLforeach{marks}{%
\assignI=Assignment 1,%
\assignII=Assignment 2,%
\assignIII=Assignment 3}{%
\DTLmeanforall{\theMean}{\assignI,\assignII,\assignIII}%
\DTLround{\theMean}{\theMean}{0}\DTLclip{\theMean}{\theMean}%
\DTLappendtorow{Average}{\theMean}}
\begin{table}
\caption{Student Marks}
\centering
\DTLdisplaydb[Address,RegNum,Title]{marks}
\end{table}
\begin{figure}[htbp]
\centering
% compute the overall mean
\DTLmeanforkeys{marks}{Average}{\overallmean}
% round it to 2 decimal places
\DTLround{\overallmean}{\overallmean}{2}
% draw a grey dotted line indicating the overall mean
% covering the entire width of the bar chart
\renewcommand*{\DTLbaratendtikz}{%
\draw[lightgray,loosely dotted] (0,\overallmean) --
(\DTLbarchartwidth,\overallmean)
node[right,black]{Average (\overallmean)};}
% Set the lower bar labels to draw a brace across the current
% group, along with the student's name and average score
\renewcommand*{\DTLdisplaylowerbarlabel}[1]{%
\tikz[baseline=(current bounding box.center)]{
\draw[snake=brace,rotate=-90](0,0) -- (\DTLbargroupwidth,0);}
\DTLround{\theMean}{\theMean}{2}%
\shortstack{#1\\(Average: \theMean)}}
% draw the bar chart
\DTLmultibarchart{variables={\assignI,\assignII,\assignIII},
barwidth=10pt,uppermultibarlabels={\assignI,\assignII,\assignIII},
barlabel={\firstname\ \surname}}{marks}
{\surname=Surname,\firstname=First Name,\assignI=Assignment 1,%
\assignII=Assignment 2,\assignIII=Assignment 3,\theMean=Average}
\caption{Student marks}
\end{figure}
\end{document}
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