How to merge cells?

Question

I want to make a table like the image below, i.e. I need to merge the cells under 12- and 1-2.

Thank you and sorry but I don't speak english (sorry for my english)

\begin{table}[ht]
 \centering
 \label{my-label}
\begin{tabular} {|p{2cm}||p{1.3cm}|p{1.5cm}|p{2.2cm}|p{1.3cm}|p{1.3cm}|p{1.5cm}|p{1.3cm}|  }
 \hline
Dita/Koha & 9-10 & 10-11 & 11-12 & 12-1 &1-2 & 2-3 & 3-4 \\ [1.5ex] 
\hline\hline
E hene & Analiza & Topologji & Alg.Geometri & Pauza & & Algjelbra &  \\  [1.0ex] 
\hline
E Marte & \multicolumn{3}{| c |}{Provimi} &Pauza  & & \multicolumn{2}{| c |}{Aplikimi i Softuerit}    \\ [1.5ex] 
\hline
E Merkure & Analiza & Topologji & Alg.Geometri & Pauza &  & Algjelbra &\\[1.5ex] 
\hline
E Enjete &\multicolumn{3}{| c |}{Provimi} &Pauza  & &\multicolumn{2}{| c |}{Aplikimi i Softuerit} \\ [1.5ex] 
\hline
 E Premte & Analiza & Topologji & Alg.Geometri & Pauza &  & Algjelbra &  \\ [1.5ex] 
\hline
 E Shtune & \multicolumn{7}{| c |}{Vikendi} \\ [2.5ex] 
 \hline
E Dielle & \multicolumn{7}{| c |}{Vikendi}    \\ [2.5ex] 
 \hline
 \end{tabular}
 \end{table}

Answer 1

Use \multicolumn again!

Note that the rules should not be duplicated, so it is \multicolumn{2}{c|}{...}.

It's also better to make a macro out of repetitive jobs.

\documentclass{article}
\usepackage{array}

\newcommand{\Provimi}{\multicolumn{3}{c|}{Provimi}}
\newcommand{\Pauza}{\multicolumn{2}{c|}{Pauza}}
\newcommand{\Vikendi}{\multicolumn{7}{c|}{Vikendi}}

\begin{document}

\begin{center}

\setlength{\extrarowheight}{1.5ex}
\addtolength{\tabcolsep}{-3.5pt}

\begin{tabular} {|l|*{7}{c|}}
\hline
Dita/Koha & 9-10 & 10-11 & 11-12 & 12-1 &1-2 & 2-3 & 3-4 \\ [1.5ex] 
\hline\hline
E \textsc{hene} & Analiza & Topologji & Alg.\@ Geometri & \Pauza & Algjelbra &  \\  [1.5ex] 
\hline
E \textsc{marte} & \Provimi &\Pauza & \multicolumn{2}{c|}{Aplikimi i Softuerit}    \\ [1.5ex] 
\hline
E \textsc{merkure} & Analiza & Topologji & Alg.\@ Geometri & \Pauza & Algjelbra &\\[1.5ex] 
\hline
E \textsc{enjete} &\Provimi & \Pauza &\multicolumn{2}{c|}{Aplikimi i Softuerit} \\ [1.5ex] 
\hline
E \textsc{premte} & Analiza & Topologji & Alg.\@ Geometri & \Pauza & Algjelbra &  \\ [1.5ex] 
\hline
E \textsc{shtune} & \Vikendi \\ [1.5ex] 
\hline
E \textsc{dielle} & \Vikendi \\ [1.5ex] 
\hline
\end{tabular}

\end{center}

\end{document}

The setting to \tabcolsep is to avoid an overfull box; it might be not necessary in your case, depending on the global text width.

Answer 2

I would merge the two columns labeled "12-1" and "1-2" directly, i.e., I would provide only 1 column with label "12-2".

There's no aim to allow line breaks in any of the cells, is there? If there's not, I'd use a simple c column type instead of p column types.

\documentclass{article}
\usepackage{array}
\begin{document}
\begin{table}[ht]
\setlength\extrarowheight{4pt}
\setlength\tabcolsep{4pt}
 \centering
\caption{A timetable} \label{my-label}
\begin{tabular} {|l||*{6}{c|}}
 \hline
Dita/Koha & 9--10 & 10--11 & 11--12 & 12--2 & 2--3 & 3--4 \\ [1ex] 
\hline\hline
E hene    & Analiza & Topologji & Alg.Geometri & Pauza & Algjelbra &  \\  [1.0ex] 
\hline
E Marte   & \multicolumn{3}{c|}{Provimi}       & Pauza & \multicolumn{2}{c|}{Aplikimi i Softuerit}    \\ [1ex] 
\hline
E Merkure & Analiza & Topologji & Alg.Geometri & Pauza & Algjelbra & \\[1ex] 
\hline
E Enjete  &\multicolumn{3}{c|}{Provimi}        & Pauza & \multicolumn{2}{c|}{Aplikimi i Softuerit} \\ [1ex] 
\hline
 E Premte & Analiza & Topologji & Alg.Geometri & Pauza & Algjelbra & \\ [1ex] 
\hline
 E Shtune & \multicolumn{6}{c|}{Vikendi} \\ [1ex] 
 \hline
E Dielle  & \multicolumn{6}{c|}{Vikendi} \\ [1ex] 
 \hline
\end{tabular}
\end{table}
\end{document}