Troubleshooting fields in a join in QGIS

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Joining data is a very common GIS operation. We have a spreadsheet with one row of data for each area and we want to match it to a map layer so that we can map it. We do this in a join by matching the common field that exists in both datasets. Get it wrong, and the join won't work. This video shows you how to troubleshoot it in QGIS.

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