题型:问答题 简答题 Many teenagers feel lonely, __________ no one understands them and the changes they are going through.A.as ifB.like ifC.because ofD.for that 查看答案
题型:问答题 简答题 某数据库中有表COURSE(CNO,CNAME,TNO)、表TEACHER(TNO,TNAME,DEPART)和表SCORE(SNO,CNO,DEGREE),现要查询选修某课程的同学人数多于5人的教师姓名。请补全下列语句: SELECT TNAME FROM TEACHER WHERE () (SELECT X.TNO FROM COURSE X,TEACHER Y,SCORE Z WHERE() () () ) 查看答案