Positioning table to the bottom left of a node

Question

I am having trouble with the positioning of a table. I have a node just below the center of the page and would like to place a table on the bottom left of such node, but when compiling it places the table at the top and in front of the top node. I would like to know what may I use in order to fix this.

\documentclass[a4paper]{article}
\usepackage[margin=0.5in]{geometry}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{tikz}
\usetikzlibrary{calc,shapes}
\usepackage{pdflscape}
\usepackage{float}
\restylefloat{table}
\begin{document}
\thispagestyle{empty}
\begin{landscape}
\centering
\begin{tikzpicture}[every node/.style={circle,draw=black},scale=0.75,every node/.append style={transform shape}]
\node(tre1)[circle,draw,scale=0.5]{
\begin{tikzpicture}
\node(tree1){1}
 child{node{2}}
 child{node{3}}
 child{node{4}};
\end{tikzpicture}
};
\node at ($(tre1) + (2,-13.5)$)(root)[circle,draw,scale=0.9]{
\begin{tikzpicture}  
\node(one){1};
\node[below of=one](two){2};
\node[right of=one]{3};
\node[right of=two]{4};
\end{tikzpicture}
};   
\begin{tabular}{|c|c|c|} \hline 
a & $a(P)$ & $A(P)$ \\ \hline

0 & 1 & 1 \\ \hline 

1 & 1 & 1 \\ \hline 

1 & 0 & 1 \\ \hline 

1 & 1 & 1 \\ \hline 

\end{tabular} 
\end{tikzpicture}
\end{landscape}
\end{document}

Answer 1

There were two major issues with your code. First, as mentioned by Skillmon, the tabular needs to go inside a node. Then it is easy to place it, in particular if you load the positioning library. Then, arguably even worse, you were nesting tikzpictures, and the consensus is that this is to be avoided. You may put tikzpictures inside \saveboxes, then there is no problem.

Looking at the output of the repaired code

\documentclass[a4paper]{article}
\usepackage[margin=0.5in]{geometry}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{tikz}
\usetikzlibrary{calc,shapes,positioning}
\usepackage{pdflscape}
\usepackage{float}
\restylefloat{table}
\tikzset{my commandments/.style={every node/.style={circle,draw=black},
scale=0.75,every node/.append style={transform shape}}}
\newsavebox\BoxOne
\sbox\BoxOne{\begin{tikzpicture}[my commandments,scale=1]
\node(tree1){1}
 child{node{2}}
 child{node{3}}
 child{node{4}};
\end{tikzpicture}}
\newsavebox\BoxTwo
\sbox\BoxTwo{\begin{tikzpicture}[my commandments,scale=1,node distance=8pt]  
\node(one){1};
\node[below=of one](two){2};
\node[right=of one]{3};
\node[right=of two]{4};
\end{tikzpicture}}

\begin{document}
\thispagestyle{empty}
\begin{landscape}
\centering
\begin{tikzpicture}[my commandments]
\node(tre1)[circle,draw,scale=0.5]{\usebox\BoxOne};
\node at ($(tre1) + (2,-13.5)$)(root)[circle,draw,scale=0.9]{\usebox\BoxTwo}; 
% comment this out to see that the nodes have the same size
%\node[blue,scale=0.5] at (root.center) {\usebox\BoxOne};
\node[below left=of root,rectangle,draw=none]{
\begin{tabular}{|c|c|c|} 
\hline 
a & $a(P)$ & $A(P)$ \\ 
\hline
0 & 1 & 1 \\ 
\hline 
1 & 1 & 1 \\ 
\hline 
1 & 0 & 1 \\ 
\hline 
1 & 1 & 1 \\ 
\hline 
\end{tabular}};
\end{tikzpicture}
\end{landscape}
\end{document}

I am actually not quite sure if that's what you're after, but it may be a basis of an answer.