When setting up a map to print using the QGIS Composer, how can I insert a label linked to a specific table record?
I have been using the latest development build (1.9.0) which has the new Expression Builder functionality, but still can't figure out how to do this.
Example: I have a paddock layer with hundreds of paddock areas scattered over the country. Each area polygon is linked to a farm ID attribute. I want to create a composer view for each farm. On each view, I want a label that inserts the total hectares of all paddocks for that one farm.
Either I have to get the Expression Builder to filter then add up areas and produce a total, or do this separately in a database table which is easy enough - but then how to access it?