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There is the Field Calculator which has a lot of functionalities. Then there is Select by Expression which has a SQL Style Syntax. However, is it possible to write plain SQL in QGIS on a Layer like a shapefile or geopackage?

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No, the tool Select by Expression is not using proper SQL. It's QGIS Expression. https://docs.qgis.org/latest/en/docs/user_manual/working_with_vector/expression.html

It has its own syntax. But it works for any layer provider : ogr, geopackage, postgresql, csv as long as you have loaded the layer in QGIS.

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  • I know that, that is why I am asking if there is a specific tool that uses SQL :)
    – four-eyes
    Feb 18, 2022 at 8:02
  • Well, your question is not really clear. Can you copy paste exactly your query as an example ? Virtual layer might be ok ? Layer properties -> Source -> Query builder is SQL dialect on shapefile etc, but for filtering. What is the final goal, select, extract, filter ?
    – etrimaille
    Feb 18, 2022 at 16:04

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