Case when and then

100xp

Often it's useful to look at a numerical field not as raw data, but instead as being in different categories or groups.

You can use CASE with WHEN, THEN, ELSE, and END to define a new grouping field.

Instructions

Using the countries table, create a new field AS geosize_group that groups the countries into three groups:

If surface_area is greater than 2 million, geosize_group is 'large'.
If surface_area is greater than 350 thousand but not larger than 2 million, geosize_group is 'medium'.
Otherwise, geosize_group is 'small'.