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      <title>大学SQL拿A却在MAANG面试翻车：高校课程与产业现实的断层</title>
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      <description>大学SQL拿A却在MAANG面试翻车：高校课程与产业现实的断层 大学300级数据库课写SELECT * FROM users JOIN orders拿A的学生，面试MAANG时却被要求计算按cohort分区的7天滚动用户留存率并填补零活动天数，结果直接挂掉。这道题暴露了从简单JOIN到真实生产SQL的断层。 中国</description>
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