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filter - Filtering a layer with attribute value from another layer in Qgis 2.18 - Geographic Information Systems Stack Exchange
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Stored filter expressions on attribute table · Issue #152 · qgis/QGIS-Enhancement-Proposals · GitHub
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expression] relation_aggregate has no filter option but order_by · Issue #36842 · qgis/QGIS · GitHub
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Filter expression from relation reference widget on attributes form, not working properly · Issue #42803 · qgis/QGIS · GitHub
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