 Hello, in this video I'm going to join attribute tables. In a previous video I've imported two spreadsheets, one with the geometry of meteorological stations in the Netherlands, that's the points layer that you can see here, the KNMI stations layer, and another spreadsheet that has temperatures of stations with no geometry. What they have in common is the number of the meteorological station that exists in both attribute tables as a field. Based on that we can do a join. Click right on the layer with the points with the geometry and go to the layer properties. Choose the joins tab and click the plus to add a new join. Here you see that it automatically already sees that the station numbers are the same in both tables. We choose only the temperatures to join and we choose a custom field name prefix to distinguish what has been joined. You get a summary and if we click OK the join is made and if I open the attribute table I can now see that this KNMI stations file also has the temperatures. In a join, the join field is not added to the original KNMI stations layer here but it's something that exists in memory and that can be saved to the project. If you want a layer which contains all these fields you need to export it to a new file and then all these fields will be in the file. If I now remove the KNMI temperatures table from the layers panel, the join will be broken and the temperature values will be gone. In this video you have learned how to join attribute tables based on a common field.