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Answer by Matt for Accessing aggregate functions on another layer in QGIS

@parent is the current feature in the streets layer.aggregate(layer:= 'stakes', aggregate:= 'count', expression:= Streetlink, filter:= Streetlink = attribute(@parent, 'Name') )

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Accessing aggregate functions on another layer in QGIS

I am using QGIS where I have:Layer 1 STREETS : lines each of one representing a street (one line one street), with different fields, with a unique id called "Name" (string)Layer 2 STAKES : points, each...

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