Total value of trades


Suppose you're given the following table showing open, high, low, and close prices for a stock on a given date (preview of the schema, full schema in link below):

Table: Prices

Date Open High Low Close
2020-01-02 00:00:00 1875 1898.01 1864.15 1898.01
2020-01-03 00:00:00 1864.5 1886.2 1864.5 1874.97
2020-01-06 00:00:00 1860 1903.69 1860 1902.88
2020-01-07 00:00:00 1904.5 1913.89 1892.04 1906.86

Given this, calculate the 20-day moving average of the closing price. Then, if the price of the day's open is greater than the 20-day moving average, you will "buy" the stock and sell on close for that day. Using this strategy, write a SQL query to calculate the total value of these trades.

You can view/query the table in an interactive SQL fiddle here.


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