sql-case列转行

select ID,Score,
case
 when Score>=90 then ‘A‘
 when Score>=80 then ‘B‘
 when Score>=70 then ‘C‘
 when Score>=60 then ‘D‘
 when Score>=50 then ‘E‘
  end
from dbo.Scores

select stuNo,
sum(case when Subject=‘生物‘ then Score end) as 生物,
sum(case when Subject=‘数学‘ then Score end) as 数学,
sum(case when Subject=‘英语‘ then Score end) as 英语,
sum(case when Subject=‘语文‘ then Score end) as 语文
  from dbo.Scores group by StuNo