sql server分组按顺序编号(转+补充)

原文链接：https://www.cnblogs.com/kevin-kw/p/6256585.html

 

如下有一个城市区域表region：

我们需要对上表region按city分组，对region进行排序，得到如下结果：

select city,region, 
right('100'+row_number()over(partition by city order by region),2) as region_no 
 from region

本版本补充，这样可以将01变为1：

select city,region, 
CAST(right('100'+row_number()over(partition by city order by region),2),AS INT) as region_no 
 from region