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How can I export a data table which where I have a list of all unique variablrs contained in one or some attribute columns? I'm using QGIS 3.4 and I have an attribute column which has about 20 uniuque characters repeated for 1973 polygons. I would link to have a list of them and same for other columns.

How can I export a data table which where I have a list of all unique variables contained in one or some attribute columns?

I'm using QGIS 3.4 and I have an attribute column which has about 20 unique characters repeated for 1973 polygons.

I would like to have a list of them and the same for other columns.

How can I export a data table which where I have a list of all unique variablrs contained in one or some attribute columns? I'm using QGIS 3.4 and I have an attribute column which has about 20 uniuque characters repeted for 1973 polygons. I would link to have a list of them and same for other columns.

How can I export a data table which where I have a list of all unique variablrs contained in one or some attribute columns? I'm using QGIS 3.4 and I have an attribute column which has about 20 uniuque characters repeated for 1973 polygons. I would link to have a list of them and same for other columns.