I would like to rename some fields in my attribute table:
"XRF_N3"in something else. It seems quite a easy issue but I don't find any information about how can I do that.
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Since 2.16, you can edit field names in the layer properties when editing is enabled:
Renaming is possible using Table Manager plugin (http://plugins.qgis.org/plugins/tablemanager/)
You can use Refactor Fields from processing toolbox. It will create a new layer as output having the new names you defined. Besides that, this tool also allows to change field types, field order and other stuff. You can also rename more than one field at once.
This algorithm allows editing the structure of the attributes table of a vector layer. Fields can be modified in their type and name, using a fields mapping. The original layer is not modified. A new layer is generated, which contains a modified attribute table, according to the provided fields mapping. Rows in orange have constraints in the template layer from which these fields were loaded. Treat this information as a hint during configuration. No constraints will be added on an output layer nor will they be checked or enforced by the algorithm.