如何把在集团计数器通过使用SQL

Question

我有下面对应的数据2列：

Name Category 
A  SL 
B  SL 
C  SL 
A  SL 
A  SL 
C  SL 

现在在我的剧本

，我组他们在类别知道他们发生了多少次反：

select Name, count(*) from Customer 
group by Category 

，但我想他们有多少次出现在查询像下面计数：

Customer Number# 
A   1 (means its the first time it occurs) 
A   2 (means its the second time it occurs) 
A   3 (means its the third time it occurs) 

。 ...等等

B   1 (means its the first time it occurs) 
C   1 (means its the first time it occurs) 
C   2 (means its the second time it occurs) 

对不起，有点困惑，希望大家明白。

谢谢。

Answer 1

尝试以下查询： -

SELECT name + '-' + CAST(ROW_NUMBER() OVER (
      PARTITION BY NAME ORDER BY id) AS VARCHAR(24)) 
FROM YOUR_TABLE