[i am trying to insert a table into a two column document. but i was unable to do it. i have tried many things but not able to get the correct way. I want the table to be in center of the page even the document is two column oriented
\lipsum[1]
\begin{table*}
\centering
\begin{tabular}[b]{l l l l l l l l}
& 2011 & 2012 & 2013 & 2014 & 2015 & 2016 & 2017 \\ \hline
Networking & 0.15 & 0.23 & 0.42 & 0.65 & 0.85 & 1.01 & 1.15 \\
NoSQL & 0.07 & 0.13 & 0.29 & 0.5 & 0.8 & 1 & 1.2 \\
Infrastructure Software & 0.14 & 0.44 & 0.83 & 1.08 & 1.25 & 1.6 & 1.9 \\
SQL & 0.62 & 0.88 & 1.31 & 1.75 & 2.25 & 2.45 & 2.7 \\
Cloud & 0.36 & 0.62 & 1.19 & 1.82 & 2.52 & 3.05 & 3.65 \\
Storage & 1.1 & 1.75 & 3.09 & 4.2 & 5.5 & 6.4 & 6.95 \\
Computation & 1.53 & 2.29 & 3.65 & 4.92 & 6.4 & 7.1 & 7.6 \\
Apps \& Analytics & 0.52 & 0.99 & 1.69 & 3.45 & 5.29 & 6.65 & 7.75 \\
Professional Services & 2.8 & 4.42 & 6.15 & 10.1 & 13.5 & 16 & 17.2 \\
\end{tabular}
\caption{This is the caption for complicated table}
\label{tab:1}
\end{table*}
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\begin{table*}...\end{table*}? This is just a guess because you didn't explain the kind of document, and how you format the table. Could you do it?table*environment should do the job.table*can only go to the top of the page. Placing it in the middle of the page would only make unclear to the reader how the text is split across the four chunks.table*can go only at the top of the page, that means it must be input before the page on which it should appear, although that means its position in the input is not "logical". adding comments in appropriate places in the input to explain what has been done is very useful in such a situation. also, since it might be necessary to move the table code around in the input, you might consider putting it in a separate file and calling it in; that's a lot more reliable than moving big chunks of code around in a file, even with a good editor.