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I have shapefile data set (Road segments) my area of interest is to calculate the length of all road segments having a particular attribute, e.g.: sum of (length attribute) when Attribute1=something. How to do this in QGIS using python, graphical model or any suitable method?

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    Have you read the documentation on the sum() expression? If so, what is left unclear?
    – Erik
    Commented Mar 23, 2022 at 11:22

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Here is one suggestion. Functions are available from processing toolbox.

  1. Run Add Geometry attributes which will add a field length to a new in- memory layer.
  2. Run Statistics by Category on the in-memory layer with field length selected for stats and your category attribute chosen: enter image description here The output of this will be a table:

enter image description here

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