找出缺考过任意科目的学生名单 验收标准： 4条查询全部跑通，结果正确 能口头解释每一条SQL的执行逻辑（不是念SQL，是解释"数据库拿到这条SQL后怎么一步步算出结果"） 📦 模块二：子查询与CTE（第4-5天） 这是区分"学过SQL"和"会写SQL"的分水岭。
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