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CREATE TABLE grade ( student_id, numeric_grade, section_id, grade_type_code ) AS SELECT 1, 10, 86, 'FI' FROM DUAL UNION ALL SELECT 2, 11, 86, 'FI' FROM DUAL UNION ALL SELECT 3, 12, 86, 'FI' FROM DUAL UNION ALL SELECT 4, 13, 86, 'FI' FROM DUAL UNION ALL SELECT 5, 14, 86, 'FI' FROM DUAL UNION ALL SELECT 6, 15, 86, 'FI' FROM DUAL UNION ALL SELECT 7, 16, 86, 'FI' FROM DUAL UNION ALL SELECT 8, 17, 86, 'FI' FROM DUAL UNION ALL SELECT 9, 18, 86, 'FI' FROM DUAL UNION ALL SELECT 10, 19, 86, 'FI' FROM DUAL UNION ALL SELECT 11, 20, 86, 'FI' FROM DUAL;
11 rows affected
SELECT COUNT( DISTINCT student_id ) AS number_below_average FROM ( SELECT student_id, numeric_grade, AVG( numeric_grade ) OVER () as avg_numeric_grade FROM grade WHERE section_id = 86 AND grade_type_code = 'FI' ) WHERE numeric_grade < avg_numeric_grade
NUMBER_BELOW_AVERAGE
5
SELECT COUNT( DISTINCT student_id ) AS number_below_average FROM grade WHERE section_id = 86 AND grade_type_code = 'FI' AND numeric_grade < ( SELECT AVG( numeric_grade ) FROM grade WHERE section_id = 86 AND grade_type_code = 'FI' )
NUMBER_BELOW_AVERAGE
5