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**Explanation:** The result table should contain all students and all subjects. Alice attended the Math exam 3 times, the Physics exam 2 times, and the Programming exam 1 time. Bob attended the Math exam 1 time, the Programming exam 1 time, and did not attend the Physics exam. Alex did not attend any exams. John attended the Math exam 1 time, the Physics exam 1 time, and the Programming exam 1 time.
105
+
**Explanation:**
106
+
107
+
The result table should contain all students and all subjects.
108
+
109
+
Alice attended the Math exam 3 times, the Physics exam 2 times, and the Programming exam 1 time.
110
+
111
+
Bob attended the Math exam 1 time, the Programming exam 1 time, and did not attend the Physics exam.
112
+
113
+
Alex did not attend any exams.
114
+
115
+
John attended the Math exam 1 time, the Physics exam 1 time, and the Programming exam 1 time.