Filtering grades based on city avg, in SQL


Given the following table, called 'students', write a SQL query to count the # of students with grades above the Detroit average.

age city grade name
0 20 Detroit 88 Willard Morris
1 19 Detroit 95 Al Jennings
2 22 New York 92 Omar Mullins
3 21 San Francisco 70 Spencer McDaniel


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