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GROUP BY Extensions in MS SQL Server

Introduction
CUBE
Summary

Instruction

Great! Lastly, the function COALESCE() can be used in the SELECT clause to replace NULL values with the values of your choice:

SELECT
  GROUPING_ID(Location, Gender, Risk) AS GroupingId,
  COALESCE(Location, '--') AS Location,
  COALESCE(Gender, '--') AS Gender,
  COALESCE(Risk, '--') AS Risk,
  AVG(Age) AS AvgAge
FROM VaccineAdministration
GROUP BY 
  CUBE (Location, Gender, Risk);

In the query above, '--' will be shown when Location, Gender, or Risk is NULL.

Exercise

Run the template query and note how NULLs are replaced with '--'.