I´ve got some polygons that I want to colourize by multiple columns. Can this be done or will I have to edit the attributes? Some polygons only have data-attributes in 1 one column, where as other have data in both column 1,2 and 3. I´m thinking of the concept like the pie chart function in the diagrams-function in layer properties. In this case I want my polygons splitted in colors by the values in the columns.
Answer
You can define rule-based symbology, which then allows you to create the rules using the usual QGIS expression builder.
In this example, I created just 2 rules, one with one field, the other with two fields. You open the expression builder with .... in the Rule properties window. 
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