Dear friends I have more details to better explain my problem (composed key): A composed Primary Key is a key composed by two (or more) columns.
I'll try to explain with an exanple: I have a country with different regions and sub-regions. Sometimes, these regions are changed. The geometry is different everytime I have a new version. The PK for one region is the column with the RegionID and the version ID. Region (PK) (not unique) Version (PK) (not unique) Description ... ... the_geom Any subregion must connect to the region, considering both columns as PK, the region and the version. Somewhere in time that subregion was linked to one region and then moved to another region and I must keep track of those changes. With this scenario, I can't connect this table to QGIS. Best Regards Joaquim
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