Hi, unless the number of combinations is known and limited, using case when function could become a nightmare.
QGIS 2.16 provides aggregates functions ( http://qgis.org/fr/site/forusers/visualchangelog216/index.html#feature-aggregate-support-for-expressions) that I think would help to do this but I'm unable to find the right syntax, if ever. Regards, Harrissou 2016-08-14 14:07 GMT+02:00 Christine <geo.gu...@web.de>: > Salvatore Oliveto wrote > > Hi, I have a Qgis layer with a table with twno columns X and Y. > > The X column has a set of values, while in the Y column I have to > enter, > > using field calculator, for each record the progressive value. Eg : X > > column values: a , b , c , d ; Y column values (to be calculated with the > > field calculator from Y column): a; a + b; a + b + c; a + b + c + d. > > Hi Salvatore, > not really sure, if I understood you properly, but you can use a "case when > ... then ... else" condition in field calculator. Please adapt the > following > pattern to your needs: > > CASE > WHEN X = a THEN a > WHEN X = b THEN a+b > WHEN X = c THEN a+b+c > WHEN X = d THEN a+b+c+d > ELSE 'error value' > END > > Hope this helps, > regards, Christine > > > > > > > -- > View this message in context: http://osgeo-org.1560.x6. > nabble.com/calculating-progressive-value-tp5280693p5280699.html > Sent from the Quantum GIS - User mailing list archive at Nabble.com. > _______________________________________________ > Qgis-user mailing list > Qgis-user@lists.osgeo.org > List info: http://lists.osgeo.org/mailman/listinfo/qgis-user > Unsubscribe: http://lists.osgeo.org/mailman/listinfo/qgis-user
_______________________________________________ Qgis-user mailing list Qgis-user@lists.osgeo.org List info: http://lists.osgeo.org/mailman/listinfo/qgis-user Unsubscribe: http://lists.osgeo.org/mailman/listinfo/qgis-user
