Ciao Giuseppe, Il motivo per cui il link alla stazione 2 ti da null è che se tu linki al csv, dove la classe 2 esiste, ai punti dove non è contemplata il 2 corrispondente al link diventa null! In altre parole puoi linkare esclusivamente classi di valore corrispondente! 1 e 1, 2 e 2, ecc. Spero di essere stato chiaro Antonio Il giorno 12/set/2013 18:11, "venerio giuseppe anardu" <[email protected]> ha scritto:
> Hello to everybody, > > I'm a beginner in the study of db and right now I'm co-working with a team > involved in wetlands. I would like to manage a qgis project of a swamp, > joining to a shapefile of the sampling points a csv file containing the > different species of algae found in each sample point and I would like to > do in a simple way considering the few points and samples I have to manage. > The structure of the attributes table of the point shapefile is made of 2 > fields: "ID" and "Sample points" > > ID | Sample points > ____|____________________ > 0 | 1 > 1 | 2 > 2 | 3 > > The structure of the csv file is made also of 2 fields: "Stations" and > "Species". > > Stations | Species > ________|____________________ > 1 | Barbula unguiculata > 1 | Bryum sp. > 1 | Funaria hygrometrica > 3 | Barbula unguiculata > 3 | Barbula unguiculata > > The field to join is "Sample points" and "Stations". > From properties I made a Join, but the result I obtain is (the samples of > point 2 are missing dued to draught): > > Sample point | Species > ____________|___________________ > 1 | Barbula unguiculata > 2 | NULL > 3 | Barbula unguiculata > > Is there a way to include in the project all the species for each sampling > point? In wich way the db may be structured and managed with qgis, maybe > using Excel or Access or the equivalents of Open Office? > With many thanks in advance, > Giuseppe > > > _______________________________________________ > Qgis-user mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/qgis-user >
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