This problem asks for a SQL query that returns the average transaction value for each day. The example input table has three days, with transaction values of 10, 20, and 30 respectively. The expected output table would have the same three days, with average values of 10, 15, and 20.
The solution above is optimal because it uses the AVG function to calculate the average value for each day.
Evaluated at: 2022-11-10 02:15:56