I uploaded a CSV with WKT polygon coordinates. Each polygon was displayed spatially and I re-saved the file as a shapefile.
The problem is most attribute columns are being detected as text, and they should be numeric, integer values. This causes problems when sorting the data.
There are about 100 columns that are incorrectly classified as text.
Is there a way to easily convert all of them to integer?
I am using QGIS 2.18.15.