documentclass{article}
usepackage{pgfplotstable}

pgfplotsset{compat=1.15}

begin{document}
pgfplotstableread{
x   xmin xmax par1    y cat par2
0.5    0    1  yes  0.3   1   no
1.5    1    2  yes  0.6   1   no
2.5    2    3  yes  0.7   1   no
0.5    0    1  yes  0.4   2   no
1.5    1    2  yes  0.5   2   no
2.5    2    3  yes  0.9   2   no
}data

pgfplotstableread{
x   xmin xmax par1    y cat par2
0.5    0    1  yes  0.3   1   no
1.5    1    2  yes  0.6   1   no
2.5    2    3  yes  0.7   1   no
2.5    3    3  yes  0.7   1   no
}dataA

pgfplotstableread{
x   xmin xmax par1    y cat par2
0.5    0    1  yes  0.4   2   no
1.5    1    2  yes  0.5   2   no
2.5    2    3  yes  0.9   2   no
2.5    3    3  yes  0.9   2   no
}dataB

begin{tikzpicture}
  begin{axis}[ybar, ymin=0, ymax=1, xmin=-0.5, xmax=3.5]
    addplot[black, ybar interval] table[x=xmin,y=y] {dataA}closedcycle;
  end{axis}
end{tikzpicture}

begin{tikzpicture}
  begin{axis}[ybar, ymin=0, ymax=1, xmin=-0.5, xmax=3.5]
    addplot[black, ybar interval] table[x=xmin,y=y] {dataB}closedcycle;
  end{axis}
end{tikzpicture}

end{document}

newcommand{filtertable}[2]{
pgfplotstabletypeset[
  columns/par1/.style={string type},
  columns/par2/.style={string type},
  row predicate/.code={%
  pgfplotstablegetelem{##1}{cat}of{#1}
  ifnumpgfplotsretval=#2relax
  elsepgfplotstableuserowfalsefi}
]{#1}
}

filtertable{data}{1}
filtertable{data}{2}