What is the grade of each high schooler?
SELECT grade FROM Highschooler
SELECT grade FROM Highschooler
[{'grade': 9}, {'grade': 9}, {'grade': 9}, {'grade': 9}, {'grade': 10}, {'grade': 10}, {'grade': 10}, {'grade': 10}, {'grade': 11}, {'grade': 11}, {'grade': 11}, {'grade': 11}, {'grade': 12}, {'grade': 12}, {'grade': 12}, {'grade': 12}]