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I have an ArcGIS 10.5.1 enterprise geodatabase hosted on PostgreSQL 9.4 (non-PostGIS enabled, but with SDE.ST_Geometry support). I'd like to add some feature classes as layers in QGIS. How can I do this?
It's not possible - you need to use real PostGIS geometries instead.
In QGIS open the Data Source Manager, click PostgreSQL on the left, add a new connection, fill out the database connection details:
Once that's added click Connect. Once you're all connected up you can add any layers you want.
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