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I would like to classify shapefile values using graduated style in QGIS, but instead of using the default mode of classification (e.g.natural breaks with values range 0-10, 10-20, 20-30), I would like to set the values range to 0-10, 11-20, 21-30. Is it possible?

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You can use Rule based classification, i.e. create a rule for each of the intervals. But be careful with the use of > greater than and >= greater than or equal.

To put this more into perspective, consider the following example:

First interval: value > 0 AND value < 10

Second interval: value >= 10 AND value < 20

If you don't use the >= for the second interval and just use >, and you happen to have a value of exactly 10, this value will be omitted from the classification.

Is your field integer or real?

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