I'm mapping areas in QGIS 2.12 based on average pricing, using area polygons (PostGIS) joined with a CSV data table that doesn't have values for areas that didn't have any sales.
I'd like to color the areas that don't have matching "area" values in my data table, but also use a green to red ramp on the areas that do have pricing.
My data is set up like this:
- area, avgprice, sales
- A, 50000, 100
- B, 100000, 50
- C, NULL, NULL
- D, 250000, 20
Maybe there is a way to use a categorized style, but I don't if there is a way to set value ranges instead of distinct values for that methodology.