Sum of Invoice Totals

In this challenge, you are required to determine the sum of all invoice totals in the chinook database.

Table Used:

• Invoice

Instructions:

1. Write a query that calculates the sum of all invoice totals.
2. The result should only have one column named TotalSum.
3. The results should be ordered by TotalSum.

Expected Output:

• A single row with a column TotalSum showing the cumulative sum of all invoice totals.