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在之前的数据中，同一班级中没有两个分数相同的学生，这样运行开窗函数row_number后，不足以直观感觉到其与rank的不同
Aetheryne
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在之前的数据中，同一班级中没有两个分数相同的学生，这样运行开窗函数row_number后，不足以直观感觉到其与rank的不同