pgfplot axis mark

Question

This is my first try with pgfplots and I have two problems that I need help with. The code is the following:

\documentclass{article}
\usepackage{tikz}
\usepackage{pgfplots}
\usepackage{verbatim}

\begin{document}

\begin{tikzpicture}
\begin{axis}[
width=10cm,
height=8cm,
ybar,
ymin=0,
ymax=12000,
ymajorgrids=true,
legend style={at={(0.5,-0.2)},
anchor=north,legend columns=-1},
ylabel={Query Response Time (in ms)},
xlabel={Queries},
symbolic x coords={SA1,SA2,SA3,GA1,GA2,GA3},
%xtick=\empty,
ytick={0,2000,4000,6000,8000,10000},
yticklabels={0,2000,4000,6000,8000,10000},
]
\addplot coordinates {(SA1,192) (SA2,597) (SA3,21) (GA1,750) (GA2,1650) (GA3,489) };
\addplot coordinates {(SA1,300) (SA2,1000) (SA3,226) (GA1,2875) (GA2,8719) (GA3,2235) };
\addplot coordinates {(SA1,375) (SA2,1297) (SA3,360) (GA1,4500) (GA2,10871) (GA3,4580) };
\legend{AQ,CAA,Virtuoso}
\end{axis}
\end{tikzpicture}

\end{document}

This generates the following plot:

Question 1: How do I get rid of the $*10^4$ at the top of the y-axis?

Question 2: How do I get rid of the x-axis ticks? I tried to put in xtick=\empty, but that gave an error.

Answer 1

Question 1: Use the scaled y ticks key and let pgfplots do the labels (ie do not specify the key ytickslabel).

Question 2: Use the major x tick style setting it to transparent so that they won't be visible.

\documentclass{standalone}
\usepackage{tikz}
\usepackage{pgfplots}

\begin{document}

\begin{tikzpicture}
  \begin{axis}[
    width = 10cm,
    height = 8cm,
    major x tick style = transparent,
    ybar,
    ymin = 0,
    ymax = 12000,
    ymajorgrids = true,
    legend style = {%
      at = {(0.5,-0.2)},
      anchor = north,
      legend columns = -1},
    ylabel = {Query Response Time (in ms)},
    xlabel = {Queries},
    symbolic x coords = {SA1,SA2,SA3,GA1,GA2,GA3},
    ytick = {0,2000,4000,6000,8000,10000},
    scaled y ticks = false,
    ]
    \addplot coordinates {(SA1,192) (SA2,597) (SA3,21) (GA1,750) (GA2,1650) (GA3,489) };
    \addplot coordinates {(SA1,300) (SA2,1000) (SA3,226) (GA1,2875) (GA2,8719) (GA3,2235) };
    \addplot coordinates {(SA1,375) (SA2,1297) (SA3,360) (GA1,4500) (GA2,10871) (GA3,4580) };
    \legend{AQ,CAA,Virtuoso}
  \end{axis}
\end{tikzpicture}

\end{document}