Thanks for the info. So we have a mix of SQLite and SpatiaLite functions and QGIS expressions.
The problem I see is that QGIS expressions can be used only when a virtual layer is created starting from shapefiles, because, as I have already shown in my previous mail, when working with virtual layers based on tables of a Spatialite database such expressions are not recognized and the system generates an error message. There is no uniformity between the different virtual layers and this could confuse users. Antonio Valanzano
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