Issue with vertical line in multiline table

Question

I am facing issue with vertical line. It seems that the vertical line on the seccond level is thinner than the line on the first level. Below you will find a latex code and screenshot.
I appreciate your help!
begin{table}[h]
centering

begin{tabular}{r|c|c|c|c|c}
multicolumn{1}{c|}{multirow{2}{*}{textbf{Number}}} & multicolumn{2}{|c|}{textbf{Object 1}} & multicolumn{2}{|c|}{textbf{Object 2}} & multicolumn{1}{|c}{textbf{Object 3}}
textbf{} & textbf{ 1 } & textbf{ 2 } & textbf{ 1 } & textbf{ 2 } & textbf{ 1 }  
hline
 1 & 39 & 4 & 18 & 1 & cellcolor{tableGreen}0 
 10 & 40 & 4 & 12 & cellcolor{tableGreen}2 & 4 
 100 & 49 & 5 & 13 & cellcolor{tableGreen}2 & 33 
 1000 & 15 & cellcolor{tableGreen}12 & 174 & 12 & 211

end{tabular}
caption{Messergebnisse für S1 zwischen Neo4j, Oracle und PostgreSQL in ms}
label{Table_Selektion_S1}
end{table}

azetina · Accepted Answer

Here is a MWE. You are repeating vertical lines.
documentclass{article}
usepackage[table]{xcolor}
usepackage{multirow}

begin{document}

begin{tabular}{r|c|c|c|c|c}
multicolumn{1}{c|}{multirow{2}{*}{textbf{Number}}} & multicolumn{2}{c|}{textbf{Object 1}} & multicolumn{2}{c|}{textbf{Object 2}} & multicolumn{1}{c}{textbf{Object 3}}
textbf{} & textbf{ 1 } & textbf{ 2 } & textbf{ 1 } & textbf{ 2 } & textbf{ 1 }  
hline
 1 & 39 & 4 & 18 & 1 & cellcolor{green}0 
 10 & 40 & 4 & 12 & cellcolor{green}2 & 4 
 100 & 49 & 5 & 13 & cellcolor{green}2 & 33 
 1000 & 15 & cellcolor{green}12 & 174 & 12 & 211

end{tabular}
end{document}

Zarko · Answer

You do not need all multicolumn in your table, also textbf{} is meaningless. In needed multicolumn you need vertical bar only on the right side of cells:
documentclass{article}
usepackage{multirow}
usepackage[table, dvipsnames]{xcolor}

begin{document}
    begin{table}[h]
    centering
begin{tabular}{r|c|c|c|c|c}
multirow{2}{*}{textbf{Number}} 
        &   multicolumn{2}{c|}{textbf{Object 1}}      % <---
            &   multicolumn{2}{c|}{textbf{Object 2}}  % <---
                    &   textbf{Object 3}             % <---
    &   textbf{ 1 }                                    % <---
        &   textbf{ 2 } 
            &   textbf{ 1 } 
                &   textbf{ 2 } 
                    & textbf{ 1 }  
hline
 1      & 39 & 4 & 18 & 1 & cellcolor{Green}0 
 10     & 40 & 4 & 12 & cellcolor{Green}2 & 4 
 100    & 49 & 5 & 13 & cellcolor{Green}2 & 33 
1000    & 15 & cellcolor{Green}12 & 174 & 12 & 211 
end{tabular}
caption{Messergebnisse für S1 zwischen Neo4j, Oracle und PostgreSQL in ms}
label{Table_Selektion_S1}
    end{table}
end{document}

Note: in above MWE is not used your color tableGreen since it is not known, how is defined. Please  always provide small but complete document example, which reproduce your problem.

Issue with vertical line in multiline table

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