How can I integrate ArcSDE of Oracle with the QGIS latest version?
I am using ArcGIS 10.4 and QGIS 2.16 version.
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You can make direct connectivity of Oracle database with the QGIS and even can make the edit directly into the Oracle database.
You can follow this tutorial for how to connect your oraacle spatial ( ArcSDE) with the QGIS.