/* (2) join query in Experiment 1) in the student enrollment database query operation to achieve its data connection. ① check each student' s situation and his (her) students seeking elective courses ② school number, name, elective courses and the results ③ seeking elective courses 10001 and results in more than 90 students in student number, name and achievements ④ check first lesson of each class of indirect (ie first course first course)

选课程连接查询.sql

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