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oracle SQL语句如何通过时间判断某个字段值是否下降？

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oracle SQL语句如何通过时间判断某个字段值是否下降？

比如 表中有字段

学生id、 时间、 成绩

想通过sql语句实现这样的视图：

学生id 时间 成绩 上次成绩 上上次成绩

条件: 总记录数不变，若不存在上次成绩返回空


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