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I have a virtual field in QGIS. The values are updates depending another column with a concatenate CASE statements.

I would like to edit this statement but I cannot see it.

I have attempted to use the field calculator and choose the virtual field, but the statements just disappear.

12

Go to your layer properties by double-clicking the layer (or right-click > Properties) and go to the Fields tab. You will see the list of fields available including virtual fields. The expressions are stored in the Comment column as shown in the image (the red circle highlights the Expression Builder tool which you can click to edit your expression):

Field properties of layer


Note that virtual fields are stored in the project file (.qgs) and not in the shapefile itself.

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