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I have a PostGIS database with which I am currently using QGIS to manage the layers. Say I have a layer in PostGIS that I want to do a join to to add new data in. Is it possible to do this join in-situ without having to download the layer locally, do the join and re-upload the layer, overwriting the previous one?

If this isn't possible, is the best alternative to write a script to handle the downloading, joining and re-uploading all together?

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  • could you use a view? – Ian Turton♦ Jan 11 at 13:13
  • Download DBeaver, connect to your postgresql database, write a query joining the data and create a view out of the result. Add the view to qgis. – DPSSpatial Jan 11 at 18:52
  • @BERA - I wanted QGIS to be the one to handle the downloading and re-uploading without me explicitely having to save a copy of the data, manipulate it locally and re-upload. This is effectively what it already does when making basic attribute table edits but doesn't seem to work in the same way for joined fields. – Jamie Jan 12 at 12:25
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This may not be best practice but I have found that the easiest option in my case is to just create a new field that mimics the joined fields. This avoids having to create a whole new layer which needs to be saved and re-uploaded.

Hopefully using this it will then be easier to create a script to automate the join and duplicating the fields.

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