The Sum of Closed Won Opportunity Amount per Account
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Challenge

Write a query that calculates the cumulative sum of Closed Won Opportunities per Account. Return the AccountId and use the alias totalAmount to represent the total amount.

Return the results sorted in any order.

The result format is in the following example:

AccountIdtotalAmount
0018b00002NwouzAAB50335.12
0010b00002GUxv2BBO900001.33
0018c000025HMOPAA4890003.99