documentclass{article}

usepackage{lipsum}% Just for this example

newcommand{var}{textit}
newcommand{PK}[1]{underline{var{#1}}}
newcommand{FK}[1]{textup{FK}(#1)}

newenvironment{relationalmodel}
  {parmedskip
   setlength{arraycolsep}{0pt}%
   $begin{array}{ r l }}
   {end{array}$
   parmedskip}

begin{document}

lipsum[1]

begin{relationalmodel}
  var{table}_1( &
    PK{column}_2, var{column}_3, var{column}_4, ldots ) \
  & var{column}_2 : FK{var{table}_2} \
  & var{column}_3, var{column}_4 : FK{var{table}_3} \
  & ldots
end{relationalmodel}

lipsum[2]

end{document}