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How do I add the values of a column and then insert it in different table column? e.g. I have a layer1 with attributes as follow: enter image description here

and layer2 with attributes:

enter image description here

I am trying to sum the MIN with the same ids at layer1 then insert the result in layer2.

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There is no GIS-specific aspect to your question, however, if you are using a database like PostGIS with your QGIS you can do the following: (I haven't actually checked if the syntax is correct):

WITH temp AS ( 
SELECT  the_branch, SUM(min)  as min_sum 
FROM layer1 
GROUP BY the_branch) 
UPDATE layer2
SET layer2.total_min=temp.min_sum
FROM temp
WHERE layer1.branch=temp.the_branch;
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  • you could also use a virtual layer and a query (have not checked it either) like this. – MrXsquared Jan 7 '19 at 11:17
  • @MrXsquared, good idea, haven't used it myself before though ! – muri Jan 7 '19 at 11:20

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