documentclass{article}

usepackage{tikz}
usetikzlibrary{shapes.multipart}
usetikzlibrary{matrix}
usetikzlibrary{positioning}
usetikzlibrary{shadows}
usetikzlibrary{calc}

tikzset{
    entity/.code={
        tikzset{
            rounded corners,
            name=#1,
            inner sep=2pt,
            every entity/.try,
        }%
        defentityname{#1}%
    },
    entity anchor/.style={matrix anchor=#1},
    every entity/.style={
            draw,
    },
    every property/.style={
        inner xsep=0.20cm, inner ysep=0.075cm, anchor=west, text width=1.75in
    }
}
defproperty#1{node[name=entityname-#1, every property/.try]{propertysplit#1;};}
defproperties{begingroupcatcode`_=11relaxprocessproperties}
defprocessproperties#1{endgroup%
    gdefpropertycode{}%
    foreach p in {#1}{%
    expandafterexpandafterexpandaftergdefexpandafterexpandafterexpandafterpropertycode%
            expandafterexpandafterexpandafter{expandafterpropertycodeexpandafterpropertyexpandafter{p}\}%
    }%
    propertycode%
}
defpropertysplit#1:#2;{#1:hfill#2}

defentitynamenode{%
node[every entity name/.try] (entityname-name) {entityname};
draw (entityname-name.south west) -- (entityname-name.south east);
\[1ex]
}
tikzset{
  every entity name/.style={every property/.try, align=center}
}
begin{document}
begin{tikzpicture}[every node/.style={font=ttfamily}, node distance=0.5in]
matrix [entity=Employee] {
    entitynamenode
    properties{
        Username:,
        Password :  varchar(255),
        Name :  varchar(255),
        LastName :  varchar(255)
    }
};
matrix [entity=Student] {
    entitynamenode
    properties{
        Username:,
        Password :  varchar(255),
        Name :  varchar(255),
        LastName :  varchar(255)
    }
};
%draw [one to omany] (Employee-Username:) to node[above]{label} (Student-Username:);
end{tikzpicture}
end{document}