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Total revenue for multiple periods
Calculating deltas
Creating "revenue in quarters" reports
19. Question 2


Very good! Let's try the second question.


For each month of the first half of 2017, calculate the total revenue and the revenue change (delta) as compared to the previous month. Show three columns: RevenueMonth, TotalRevenue, and Delta.

In the first row, leave the delta value as NULL. Order the results by month.

Stuck? Here's a hint!