[Qgis-user] Correct the attribute table automatically

[Neumann, Andreas]

Hi, 

The question is if you need a "physical field" (stored in your data
provider) or if a virtual field is good enough. If you don't need
physical storage in the table, I suggest you add a virtual field with an
expression to calculate the area an potentially also round/format the
result. 

You can create virtual fields in the field calculator and upate the
expression/calculcation from the fields tab in the layer properties. 

Andreas 

On 2016-02-10 10:18, Josefine Petrenz wrote: 

> hej hej,
> 
> at first, I would like to apologize for my english.
> 
> I have a shape-file with several areas. In my attribut table, each area has an information about the area size. Step by step the areas become bigger or smaller. Every time, when this happened, i have to recalculate the area size.  is there a way, that the area size correct automatically in the attribute table, when i change the area?
> 
> thanks in advance josi 
> 
> _______________________________________________
> Qgis-user mailing list
> Qgis-user at lists.osgeo.org
> List info: http://lists.osgeo.org/mailman/listinfo/qgis-user
> Unsubscribe: http://lists.osgeo.org/mailman/listinfo/qgis-user

  
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.osgeo.org/pipermail/qgis-user/attachments/20160210/c4870806/attachment.html>