How to find a list of values in attribute form then add a new value in editing mode (QGIS, GIS) - Quora
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field calculator - QGIS - look up Table to feature Layer where Table answers questions to Multiple Columns in Feature Layer - Geographic Information Systems Stack Exchange
![Joining data from Excel to attribute table in QGIS without creating duplicates? - Geographic Information Systems Stack Exchange Joining data from Excel to attribute table in QGIS without creating duplicates? - Geographic Information Systems Stack Exchange](https://i.stack.imgur.com/Iwjge.png)