I can connect to Oracle database adding and creating spatial layer.
In the same database there are non-spatial tables but I cannot view any of them when connected to the database.
I need to add these tables to QGIS to perform joins with spatial layer.
How do I add non-spatial Oracle table to QGIS?
JOIN
way faster than QGIS could. If you create views you won't need to fashion queries in the GIS software.