I have to tables inside my database (postgis). Now I will do based on QGIS execute a sql-query based on these two tables. How can I do this? There exists a tool "Execute SQL" but there I can only choose one layer. I will realize the query inside my database in postgis.
I have a Processing model. The first step was to load the two tables inside my database. The next step is to execute the sql query. How can I do this?