摘要: 高级子查询(嵌套) Select StuId,StuName, SelCourses=(Select Count(CourseId) From tblScore t1 Where t1.StuId=s1.StuId), SumScore=(Select Sum(Score) From tblScor 阅读全文
posted @ 2016-03-10 12:40 吴松~ 阅读(211) 评论(0) 推荐(0) 编辑