求下面《数据库原理》题目的正确解答答:表1 students(stuNo,name,sex,birthdate,xi,birthplace)表2 course(courseNo,name,credit)表3 elective(stuNo,courseNo,score)1、求李小波所在的系:select xi from students where name='李小波'2、求李小波所修的全部课程:select c.name from students s,course c,elective e where s.stuno...