50個查詢系列-第11個查詢：查詢至少有一門課與學號為“1001”的同學所學相同的同學的學號和姓名；

select distinct( tblstudent.StuId) from tblstudent ,

tblscore
where  tblscore.CourseId
 in
(
select tblscore.CourseId from tblscore where tblscore.StuId='1001' 
)
and tblstudent.StuId=tblscore.StuId

  答案提供兩種方法；

1：

Select DistInct st.StuId,StuName From tblStudent st
  Inner Join tblScore sc ON st.StuId=sc.StuId
   Where sc.CourseId IN (Select CourseId From tblScore Where StuId='1001')

2：

 ------嵌套子查詢
 Select StuId,StuName From tblStudent
  Where StuId In
  (
   Select Distinct StuId From tblScore Where CourseId In (Select CourseId From tblScore Where StuId='1001')
  )