[GRASS-user] the parameter column in the commond d.vect.thematic

[maven apache]

d.vect.thematic map=blue type=area column=cc themetype=graduated_colors
themecalc=interval layer=1 icon=basic/circle size=5 maxsize=20 nint=4
colorscheme=blue-red pointcolor=255:0:0 linecolor=0:0:0 startcolor=255:0:0
endcolor=0:0:255 monitor=x1
 In the help page, it say the column must be numeric,however what does the
parameter column stand for?

The following is the output from the v.report :
Displaying column types/names for database connection of layer 1:
cat|label|area
31744||2102.07044646547

The lable seems to be null.

Can I make a thematic map from more than one vector maps?
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