Hi, We would definitely need this functionality for our application modules - we need functions like "min", "max", "mean", "sum", "average" to work on 1:n relations.
Now that we have relations in QGIS, I think that aggregate functions are a logical next step. Something to seriously consider in 2.6. Andreas Am 23.05.2014 17:34, schrieb G. Allegri: > Recently I had to calculate the relative dimension of a polygon relative to > the others of the same class. I know there are a lot of way to do it, > inside and outside QGIS, but I wondered if field calculator (and > expressions in general) couls be extended to accompish this kind of tasks. > > The approach would be something similar WINDOW functions in Postgresql [1], > where for each record a new value will be calculated on the basis of other > records (filtered or not). > > Has this ever been discussed? Is it something that could fit QGIS > expressions? > > giovanni > > [1] http://www.postgresql.org/docs/9.1/static/tutorial-window.html > > > > _______________________________________________ > Qgis-developer mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/qgis-developer > _______________________________________________ Qgis-developer mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/qgis-developer
