sql server分組按順序編號(轉+補充)

原文鏈接：https://www.cnblogs.com/kevin-kw/p/6256585.html

 

如下有一個城市區域表region：

我們需要對上表region按city分組，對region進行排序，得到如下結果：

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

本版本補充，這樣可以將01變為1：

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