how to create a table in latex code example

Example 1: latex tabular

\begin{tabular}{ l | c | r }
  \hline			
  1 & 2 & 3 \\
  4 & 5 & 6 \\
  7 & 8 & 9 \\
  \hline  
\end{tabular}

Example 2: table in latex

\begin{tabular}{ |p{3cm}||p{3cm}|p{3cm}|p{3cm}|  }
 \hline
 \multicolumn{4}{|c|}{Country List} \\
 \hline
 Country Name     or Area Name& ISO ALPHA 2 Code &ISO ALPHA 3 Code&ISO numeric Code\\
 \hline
 Afghanistan   & AF    &AFG&   004\\
 Aland Islands&   AX  & ALA   &248\\
 Albania &AL & ALB&  008\\
 Algeria    &DZ & DZA&  012\\
 American Samoa&   AS  & ASM&016\\
 Andorra& AD  & AND   &020\\
 Angola& AO  & AGO&024\\
 \hline
\end{tabular}

Example 3: making simple table in latex

\begin{tabularx}{0.8\textwidth} { 
  | >{\raggedright\arraybackslash}X 
  | >{\centering\arraybackslash}X 
  | >{\raggedleft\arraybackslash}X | }
 \hline
 item 11 & item 12 & item 13 \\
 \hline
 item 21  & item 22  & item 23  \\
\hline
\end{tabularx}

Example 4: insert table latex

%...

\begin{sidewaystable}[h!] % <--
  \begin{center}
  \caption{Landscape table.}
  \label{tab:table1}
  \begin{tabular}{l|S|r}
  	\toprule
  	\textbf{Value 1} & \textbf{Value 2} & \textbf{Value 3}\\
  	$\alpha$ & $\beta$ & $\gamma$ \\
    \midrule
    1 & 1110.1 & a\\
    2 & 10.1 & b\\
    3 & 23.113231 & c\\
    \bottomrule
  \end{tabular}
  \end{center}
\end{sidewaystable}

%...