[Qgis-user] Style - graduated render

[Ramon Andiñach]

On 22/11/2011, at 14:19, Alex Mandel <tech_dev at wildintellect.com> wrote:

> On 11/21/2011 01:17 PM, David wrote:
>> Hi everyone
>> Thanks to Juan and Ramon for suggestions about Adding Data to the Attribute Table.
>> 
>> It turns out that my mistake was not having the 'layers' panel open when doing the 'join' process.   So when I used this panel, it worked!   Well, almost ....
>> 
>> Now when I open the Style box and select Graduated Render, the drop-down menu has only the columns from the original attribute table.   The columns I have added do not appear in the list.    But if I select Categorised render, all the new columns are there.
>> 
>> Anyone got any ideas?
>> David Asquith, UK
>> 
> 
> The joined columns may be text only and not numeric (possibly a bug). A work around is to add a new calculated column with the data you want, that way you can specify it's type as numeric.
> 
> Enjoy,
> Alex

That's very likely. See this thread from a few months back, it might help. 

http://lists.osgeo.org/pipermail/qgis-user/2011-August/013236.html

-ramon.