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When did you graduate from the graduate school?


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考题 从Student类和Teacher类多重派生Graduate类

考题 导入数据库ex30.sql,完成下列题目: 查询即将毕业的学生(毕业生表graduate)的姓名、性别与出生日期和学分(字段名为credit)信息。其中姓名、性别与出生日期信息记录在表“stu”中,学分(字段名为credit)信息记录在表“graduate”中。 并且把结果按学分从高到低排列。

考题 在数据库ex31.sql中完成下列题目: 查询不毕业的学生的信息. 即查询在学生信息表“stu”中,但不在毕业生表“graduate” 中的所有学生的学号与姓名信息。

考题 将students中的列变量重新命名为: (1)id_number, name, gender, score, has_graduate (2)选出Bob的性别gender,并存入变量bob_gender (3)选出列has_graduate,并存入向量status (4)创建数据框part_df,其中包含前三个学生的所有信息 (5)创建数据框rest_df,包含其余学生的所有信息