New answers tagged update
You can open the attribute table, toggle layer editable (if not yet done) open the field calculator and check Create a new field, give it a type / name and use an expression to fill it with values based on existing attributes.
The standard leaves that somewhat open to interpretation, although I would never expect an Update to result into an Insert or an Insert resulting in an Update. Especially in cases where the data is stored in a database this sort of behaviour is awkward and would require a good deal of extra code to implement. To an Update on a non-existing feature I would ...
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