SQL优化（三）执行顺序

   对“SQL优化（一）” 中建立的表执行增删改查等操做，并查看这些操做的执行过程。如“查询课程编号为2 或教师证编号为3 的老师信息”。相应的SQL查询语句以下:sql select Teacher.* from Teacher, Course, TeacherCard where Teacher.Id = Course.TeacherID and Teacher.CardID = Teac

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