TikZ Datenmodell z.B: ER-Modell erstellen

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\documentclass[margin=5mm]{standalone}
\usepackage[utf8]{inputenc}
\usepackage{tikz}
\usetikzlibrary{matrix,positioning}
\tikzset{
  tab/.style={inner sep=0pt,
    nodes={inner sep=.333em,
      % notwendig für leere Zellen und Unterlängen:
      minimum height={\baselineskip+0.666em}
    }
  },
  vtab/.style={matrix of nodes,tab,
    row sep=-\pgflinewidth,column sep=-\pgflinewidth,
    nodes in empty cells,% leere Zellen werden ebenfalls gezeichnet
    nodes={draw,align=left,text width=#1}
  },
  vtab/.default=3cm,% voreingestellte Breite
  htab/.style={matrix of nodes,draw,tab,anchor=north west},
  every edge/.append style={font=\footnotesize\strut,inner ysep=.1em},
  pfeil/.style={out=270,in=90,->}
}
\begin{document}
\begin{tikzpicture}[thick,
  % vertikaler und horizontaler Abstand zwischen den Tabellen:
  node distance=1cm and 2.5cm, 
]
% Tabellen
  \matrix(A)[vtab]{Artikel\\{Artikelnummer\newline Artikelname}\\\\};
  % für matrix P reichen 2cm als Breite
  \matrix(P)[right= of A,vtab=2cm]{Position\\Anzahl\\\\};
  \matrix(B)[right= of P,vtab]{Bestellung\\{Bestellnummer\newline Bestelldatum}\\\\};
  \matrix(K)[below= of B,vtab]{Kunde\\{Kundennummer\newline Name}\\\\};
% Verbindungen einzeichnen und beschriften
    \path(A)edge
      node[pos=0,above right]{besitzt}node[pos=0,below right]{1}
      node[pos=1,above left]{gehört zu}node[pos=1,below left]{N}
      (P);
    \path(P)edge
      node[pos=0,above right]{gehört zu}node[pos=0,below right]{N}
 
 
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