摘要: 高级查询 Select StuId,StuName, SelCourses=(Select Count(CourseId) From tblScore t1 Where t1.StuId=s1.StuId), SumScore=(Select Sum(Score) From tblScore t2 阅读全文
posted @ 2016-03-09 18:42 白兴强 阅读(503) 评论(0) 推荐(0) 编辑