The number of the column.
All Drivers
0 .. Maximum number of columns in a table.
DF_FIELD_NUMBER (Integer)
The Field_Number keyword defines a column keyword group. All subsequent column keyword settings will apply to the column with the number specified. The column number will change when another Field_Number keyword is used.
It is not possible to separate settings under multiple column groups. Every new column number will overwrite any preexisting settings.