Hey Daniel, did you have a look at virtual layers [1]? They allow you to reference as many layers and tables as you wish and perform some SQL on them to create a new layer. In addition, if you define a proper relation [2] between your layers you can use the aggregate_* [3] functions in the field calculator to get to your desired result.
HTH Frank [1] https://docs.qgis.org/2.18/en/docs/user_manual/working_with_vector/virtual_layers.html [2] https://docs.qgis.org/2.18/en/docs/user_manual/working_with_vector/attribute_table.html?highlight=relation#creating-one-or-many-to-many-relations [3] https://docs.qgis.org/2.18/en/docs/user_manual/working_with_vector/expression.html?highlight=aggregates#aggregates-functions Dipl. Geogr. Frank Broniewski Waldhölzbacher Str. 51 66679 Losheim am See 06872 509 068 4 0176 611 26 9 2 6 www.frankbroniewski.com Von: Qgis-user [mailto:qgis-user-boun...@lists.osgeo.org] Im Auftrag von Daniel Alejandro Montecinos Rubilar Gesendet: Dienstag, 20. Februar 2018 18:27 An: qgis-user@lists.osgeo.org Betreff: [Qgis-user] Problems to create new columns through two tables Hello I want to create a new column in QGIS from a cross-information of two tables. The first table are communes of my country and the second are some electrical faults plotted as points. Then I want to create a new column in table 1, by means of the following logic: NewColumn = Sum (column_value2_ of_table2) I have been using MapInfo for a long time and recently I occupy QGIS with the intention of changing and I was getting convinced until I could not perform this operation, which in MapInfo was very easy with SQL queries. I already appreciate your comments Sincerely, ________________________________ Daniel Montecinos Rubilar Electrical Civil Engineer
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