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I have a polygon layer with 3 fields (A, B and C). I want to create a copy and add as a virtual layer so I use CREATE VIRTUAL LAYER option but only want the first field.

So I use the expression Select A from "polygon layer"

But it doesnt work. What is wrong with my expression? The fields only contain string values. Do I need to specify geometry column?

This expression works Select * from "polygon layer but takes all fields.

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You forget the 4th field: geometry. It is not shown as a column, but it is there. If you do select * from layer, then in fact you call select geometry, A, B, C from layer.

So, if you want to load a copy of the original with only column 'A', you also have to call the geometry into the expression:

select geometry, A from layer
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