sqlserver 排序

sqlserver中有几种排序的方式

1、order by asc||desc  【默认值升序（asc）、降序：desc】 

列：select * from tb order by id

2、ROW_NUMBER() over(partition by columnname order by columnname)函数可以用于查询重复数据、去重复查询，删除重复数据  --虚拟自增排序

列：select ROW_NUMBER()over(order by name) as num,* from tb

select ROW_NUMBER()over(partition by name order by name) as num,* from #Tmp   --重复数据叠加

3、RANK()over(order by columnname)  --跳跃式排序  

列：select RANK()over(order by name),* from #Tmp

4、DENSE_RANK()over(order by columnname) --重叠式排序

列：select DENSE_RANK()over(order by name),* from #Tmp

5、NTILE()OVER(ORDER BY COLUMNNAME)--将数据平分排序

列：select NTILE(2)over(order by name),* from #Tmp

select NTILE(3)over(order by name),* from #Tmp