\documentclass{article}
\usepackage{multirow}
\usepackage[table]{xcolor}
\begin{document}
\begin{table}[]
\begin{tabular}{|r|l|c|}
\hline
id & produkt & Czy jest \\ \hline
1 & chleb & Tak \\ \hline
2 & sowa & Nie \\ \hline
3 & kawa & Tak \\ \hline
4 & mleko & Tak \\ \hline
5 & pies & Nie \\ \hline
\end{tabular}
\end{table}
\begin{center}
\begin{tabular}{ |c|c|c|c| }
\hline
Lp. & produkt & cena & czy jest \\
\hline
jedzenie & chleb & 20zl & Nie \\
\hline
napoje & cola & 30zl & Tak\\
& cola & 30zl & Nie \\
& cola & 30zl & Tak\\
\hline
nabial & maslo & x & x \\
& maslo & x & x \\
& maslo & x & x \\
\hline
\multicolumn{2}{| c |}{polaczone kolumny} & kolumna3 & kolumna4\\
\hline
\end{tabular}
\end{center}
\begin{table}[]
\begin{tabular}{|r|l|c|}
\hline
\rowcolor{blue!25} id & produkt & Czy jest \\ \hline
1 & chleb & Tak \\ \hline
\rowcolor{blue!25} 2 & \cellcolor{green!25} sowa & Nie \\ \hline
3 & kawa & Tak \\ \hline
\rowcolor{blue!25} 4 & mleko & Tak \\ \hline
5 & pies & Nie \\ \hline
\end{tabular}
\end{table}
\end{document}
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