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Select by Expression and Extract by Expression generate different results

Geographic Information Systems Asked on August 23, 2021

I have a polygon layer and want to extract all Polygons with the field "street" = 1.

When I use "Select by Expression" I get the following correct result:

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However, when I use "Extract by Expression" I get the following wrong results:

enter image description here

When I look into the attribute table of the extracted layer all values under the field "street" = 1 but a couple of them shouldn’t be.

What could be the problem?

I’m using QGIS 3.10

One Answer

I recreated the original vector layer and now it works. Unfortunately I haven't figured out where the problem was since I think I did the layer the same as before but extract by expression gives me now the correct results.

Correct answer by DGIS on August 23, 2021

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