use S100801A
go

select * from score

--剔除重复项
select distinct(score) from score

--保留重复项(注意：with ties 必须和 top...order by 一起使用)
select top 1 with ties score from score
order by score desc

-- newid()
select newid() as '新ID',* from score

-- 根据‘成绩’字段的降序排列生成‘行号’
select row_number() over(order by Score desc) as '行号',
stuID as '学号',Score as '成绩' from Score

-- 根据临时表 temp_Score 的‘行号’rowNum，获得‘行号’在 1-20之间的记录。
with temp_Score as
(
select row_number() over(order by Score desc) as rowNum,
stuID,Score from Score
)
select rowNum as '行号',stuID as '学号',Score as '成绩'
from temp_Score where rowNum between 1 and 20;

-- 按照分数进行排名。(分数相同的并列名次,下一个名次降一名。)
select StuID,Score,
rank() over(order by Score desc) as '名次'
from Score

-- 按照分数进行排名。(分数相同的并列名次,下一个名次不降一名。)
select StuID,Score,
dense_rank() over(order by Score desc) as '名次'
from Score

-- ntile(页数)：用来将整个表进行分页(或分组),
-- 并指定每条记录属于哪一页。
select stuID,Score,
ntile(3) over(order by Score desc) as '页码'
from Score
order by Score Desc

--===================================
-- 使用ntile(页数)分页的存储过程
--===================================

-- 删除存储过程
drop procedure up_Page
go

-- 创建存储过程
create procedure up_Page
@pageCount int, -- 定义每页显示的数据个数
@currentPage int -- 选择当前要显示的数据页
as
select * from (
select ntile((select count(*)/@pageCount from Score))
over(order by StuID) as Page,* from Score
) a where Page=@currentPage
go

--查看结果
exec up_Page 2,3
-- 表示：每页显示2条数据，当前显示第3页。