Drawing tables with colors

Question

I’m trying to create a table in my tex document that resembles more or less the table in the picture below:

I found this chunk of code but still, I don’t know how to separate each table as it appears in the picture.

 \documentclass{article}
\usepackage{booktabs}% http://ctan.org/pkg/booktabs
\usepackage{colortbl}% http://ctan.org/pkg/colortbl
\usepackage{amsmath}% http://ctan.org/pkg/amsmath
\usepackage{xcolor}% http://ctan.org/pkg/xcolor
\usepackage{graphicx}% http://ctan.org/pkg/graphicx

\colorlet{tableheadcolor}{gray!25} % Table header colour = 25% gray
\newcommand{\headcol}{\rowcolor{tableheadcolor}} %
\colorlet{tablerowcolor}{gray!10} % Table row separator colour = 10% gray
\newcommand{\rowcol}{\rowcolor{tablerowcolor}} %
    % Command \topline consists of a (slightly modified) \toprule followed by a \heavyrule rule of colour tableheadcolor (hence, 2 separate rules)
\newcommand{\topline}{\arrayrulecolor{black}\specialrule{0.1em}{\abovetopsep}{0pt}%
            \arrayrulecolor{tableheadcolor}\specialrule{\belowrulesep}{0pt}{0pt}%
            \arrayrulecolor{black}}
    % Command \midline consists of 3 rules (top colour tableheadcolor, middle colour black, bottom colour white)
\newcommand{\midline}{\arrayrulecolor{tableheadcolor}\specialrule{\aboverulesep}{0pt}{0pt}%
            \arrayrulecolor{black}\specialrule{\lightrulewidth}{0pt}{0pt}%
            \arrayrulecolor{white}\specialrule{\belowrulesep}{0pt}{0pt}%
            \arrayrulecolor{black}}
    % Command \rowmidlinecw consists of 3 rules (top colour tablerowcolor, middle colour black, bottom colour white)
\newcommand{\rowmidlinecw}{\arrayrulecolor{tablerowcolor}\specialrule{\aboverulesep}{0pt}{0pt}%
            \arrayrulecolor{black}\specialrule{\lightrulewidth}{0pt}{0pt}%
            \arrayrulecolor{white}\specialrule{\belowrulesep}{0pt}{0pt}%
            \arrayrulecolor{black}}
    % Command \rowmidlinewc consists of 3 rules (top colour white, middle colour black, bottom colour tablerowcolor)
\newcommand{\rowmidlinewc}{\arrayrulecolor{white}\specialrule{\aboverulesep}{0pt}{0pt}%
            \arrayrulecolor{black}\specialrule{\lightrulewidth}{0pt}{0pt}%
            \arrayrulecolor{tablerowcolor}\specialrule{\belowrulesep}{0pt}{0pt}%
            \arrayrulecolor{black}}
    % Command \rowmidlinew consists of 1 white rule
\newcommand{\rowmidlinew}{\arrayrulecolor{white}\specialrule{\aboverulesep}{0pt}{0pt}%
            \arrayrulecolor{black}}
    % Command \rowmidlinec consists of 1 tablerowcolor rule
\newcommand{\rowmidlinec}{\arrayrulecolor{tablerowcolor}\specialrule{\aboverulesep}{0pt}{0pt}%
            \arrayrulecolor{black}}
    % Command \bottomline consists of 2 rules (top colour
\newcommand{\bottomline}{\arrayrulecolor{white}\specialrule{\aboverulesep}{0pt}{0pt}%
            \arrayrulecolor{black}\specialrule{\heavyrulewidth}{0pt}{\belowbottomsep}}%
\newcommand{\bottomlinec}{\arrayrulecolor{tablerowcolor}\specialrule{\aboverulesep}{0pt}{0pt}%
            \arrayrulecolor{black}\specialrule{\heavyrulewidth}{0pt}{\belowbottomsep}}%

\begin{document}

\renewcommand{\arraystretch}{1.5}
\begin{tabular}{llll}
  \topline
  \headcol Approach & Estimator & ME & MAE \\
  \midline
  & $\widehat{JV}_{\text{na\"ive}}$ & 4.37e-07 & 4.37e-07 \\
  \rowcol \smash{\raisebox{1em}{Na\"ive}} & $\widetilde{JV}_{\text{na\"ive}}$ & 3.88e-07 & 3.88e-07 \\
  & $\widehat{JV}$ & 1.33e-06 & 1.33e-06 \\
   \rowcol \smash{\raisebox{1em}{Regular}} & $\widetilde{JV}$ & 1.20e-06 & 1.20e-06 \\
  \bottomlinec
\end{tabular}

\end{document}

Answer 1

\documentclass{article}
\usepackage{booktabs}
\usepackage[table]{xcolor}
\usepackage{amsmath}
\usepackage{graphicx}
\newcommand\SR{\specialrule{1pt}{1pt}{1pt}}

\begin{document}

\begingroup
\arrayrulecolor{white}\arrayrulewidth=1pt
\begin{tabular}[t]{c !{\color{white}\vrule width3pt} c !{\color{white}\vrule width3pt} c }
\rowcolor{black}\textcolor{white}{Movies} &\textcolor{white}{Ratings}\\\SR
\rowcolor{gray!25}ID & Movie ID\\\SR
\rowcolor{gray!10}Title (Year) & User ID\\\SR
\rowcolor{gray!25}Genre List & Rating \\\SR
                             & \cellcolor{gray!10}Timestamp
\end{tabular}
\endgroup

\end{document}

Answer 2

This might be an unpopular opinion, but the best way to use alternating colours in tables is to not use them. The trend to have alternating row colours goes back to word who used it at one point as default formatting. However this does not mean that this is good practise. Due to the changing background colour, the contrast between the font and the background gets reduces which actually makes it harder to read. I suggest to use a clean and professional looking design instead:

\documentclass{article}

\usepackage{booktabs}

\begin{document}

\begin{tabular}{@{}lll@{}}
\toprule
Movies & Ratings & Tags\\
\midrule
ID & Movie ID & User ID\\
Title (Year) & User ID & Movie ID\\
Genre List & Rating & Tag\\
& Timestamp & Timestamp\\
\bottomrule
\end{tabular}


\end{document}