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  3. SQL for Joining Data

Exercise

Case when and then

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

100 XP

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'.