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Introduction
Reports with revenue in categories
Revenue in time periods for selected categories
Summary

Instruction

Excellent! Let's try a similar exercise.

Exercise

Compare the category revenues for orders placed in December 2016 and December 2017. Show the following columns: category_name, december_2016, and december_2017.

Stuck? Here's a hint!

Use the following code to find orders placed in December 2016:

SUM(CASE
  WHEN order_date >= '2016-12-01' AND order_date < '2017-01-01'
    THEN oi.amount
  ELSE 0.0
END) AS december_2016