Regrouping multiple polygon with same attributes in one in QGIS

Question

In QGIS 2.14 I have a polygon shapefile with thousands of entities (=row) and > 10 attribute column.

A lot of these polygons share the exact same attributes, in fact there is only 12 different types of polygons.

I want to regroup all polygons with sames attributes in only one (so I just want to have 12 entities at the end and keep all the attribute data).

I have tried lots of options "regroup", "dissolve", "dissolve by attribute", etc... but each time one of these issues occurs :

The closest I found was SAGA "Dissolve", but it don't process on all polygons.

Any idea?

In QGIS 3.4, the Dissolve tool allows you to dissolve based on multiple attribute fields, which would achieve what you need. I don't remember if it had this feature in 2.14. — csk, Commented Jul 23, 2019 at 14:32
Does any of the tools combine the geometries the way you want (forget about the attributes here, I'm just asking about the polygons)? If so, take that output and do a spatial join (join attributes by location tool) with the original to get the attributes back. — csk, Commented Jul 23, 2019 at 14:33
Hello, yes, the "dissolve" option works great but it didn't take every polygon into account, and i can't found a legit reason why :( — Exanos, Commented Jul 23, 2019 at 15:54

csk · Accepted Answer · 2019-07-23 16:03:22Z

2

I don't know if it works on 2.14 as well but in my QGIS you can:

Not sure about the precise phrasing, because my QGIS is not in English. Hope it still helps.

csk

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answered Jul 23, 2019 at 14:43

Lukas K

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Hello! ty for your answer but i need all polygons on the same layer. Can be worth to try to fuse them after separating them still. gonna try that.
– Exanos
Commented Jul 23, 2019 at 15:55

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