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3. Help me please!! Then you can use COUNT with GROUP BY to show the number of students with each of those grades.

SELECT COUNT(*),CASE WHEN number_grade > 90 THEN 'A'WHEN number_grade > 80 AND number_grade <= 90 THEN 'B'WHEN number_grade > 70 AND number_grade <= 80 THEN 'C'ELSE 'F'END AS letter_gradeFROM stude...