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Using QGIS v 2.18.10
I'm currently working with a vector shapefile that represents zones in a municipality. I've had to create and edit polygons representing these zones. I'm looking to compress/simplify my attribute table so that each zone appears in the attribute table once.
For example, in the image above the attribute value "Residential Scheme Area" is there several times, I want that value to be there only once.
You could use the create multipart polygon tool under Vector > Geometry Tools > Single Part to multipart. In the tool select your field "Zone Name" as unique id field. This will create a multi-polygon for each class you have.
However be aware, that with this method, information regarding indivual features will be lost.
