A QGIS vector layer that is a database view built using SQL over other QGIS layers.

A special kind of vector layer in QGIS, that allows you to define a layer as the result of an advanced query, using the SQL language on any number of other vector layers that QGIS is able to open. These layers are called virtual layers: they do not carry data by themselves and can be seen as views to other layers. (Source: https://docs.qgis.org/testing/en/docs/user_manual/working_with_vector/virtual_layers.html)

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