Area calculation of objects with the same, specific formulation

Question

Can someone help me with the area calculation of certain objects in the attribute table?

I want to add up all the objects that follow a specific, same formulation of a specific column in the table. I have a large number of owners who in turn own many areas/objects. Now I want to see how much total area each owner has.

I can calculate every object of a certain column. But how does the formulation in the field calculator have to look like if I want to add up all those from column x that have the same formulation?

Answer 1

If you've got a vector layer with one attribute for the area ("SUPERFICIE" in my example) and another attribute for grouping the data ("ZONIFICACI" in my example)

You can use the "Statistics by categories" tool in the toolbox, selecting the layer; the field (attribute) for which you want the statistics ("SUPERFICIE" in my example); and the field with the categories (clicking the 3 dots button on the right and checking the corresponding field)

Click execute and you'll get a new layer with the statistics, being the sum (of the area in this example) one of the values

Answer 2

sum($area,group_by:="fieldname containing owners") it is.

For more details check the documentation page on sum.