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I am using QGIS Version 2.14.3. I have a map with polygons and a lot of different attributes. Some polygons have NULL values in some columns. I've tried to color the polygons with properties->style->graduated. But in some columns half of the values are NULL and now they don't have any colour.

I know that i could color the NULL values when I chose "categorized" coloring, but I have way to many different entries to do that, because QGIS chooses a colour for every different entry.

I need to have intervals for coloring. Is there an easy way to do that?

  • Do you store numbers of what else? – mgri May 22 '17 at 14:55
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Sounds like you need to use rule based styling.

Basically, you will create a few rules. One will be "field_name" IS NULL, and the others will be "field_name" <= 20 AND "field_name" >= 11.

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