I am trying to classify a shapefile based on rule set, following this tutorial.
This is the result: 
What I want to ask is: 1. How to insert the classification result (water, land etc) into the attribute table? I want to make each feature assign to a certain class in the attribute table. 
- How to join the vector contain same class? I tried vector-geoprocessing-dissolve, it is not working. I tried to select the polygons using same rule, then using "merge selected feature". However, the attributes value only following the first feature, meanwhile, I need the mean of each feature. Is there any way to merge the same category, and calculate the mean attributes value?
Answer
you have to do it by edit your attribut table first (Field Calculator) to put value on your class column, use conditional statement CASE based on the "rule" that you used in classification. you can take a look on this to use CASE.
After your Class Column is filled. Then you can run Split vector layer from processing toolbox. Input the vector layer , then input Class as Unique ID field.
Addition : To join features into one feature per Class, Dissolving based on your "class" Field also will do this logically.
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