查询周四上午第3节有课的同学的学号、姓名与班级名称SELECT DISTINCT student.SId, student.SName, grade.GName FROM student, grade, information WHERE student.GId = grade.GId AND information.GId = grade.GId AND information.GId = student.GId AND information.IWeek = 4 AND information.ITimeseg LIKE '...