如何在按客户分组中添加计数器

他们是同一个专栏

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

现在在我的脚本中，我将它们分组在类别中，但我想计算它们在查询中出现的次数。请看下面：

Customer-Line#
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)
....so on
----------
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)

抱歉造成混乱，希望每个人都清楚。

谢谢你，

您可以使用row_number()为同名客户添加号码：

select  name + '-' + cast(row_number() over (
            partition by name order by id) as varchar(24))
from    YourTable

如果仅在有多个客户时才需要该号码，您可以使用case when ... then ... end表达：

select  name + 
            case 
            when count(*) over (partition by name) = 1 then ''
            else '-' + cast(row_number() over (
                partition by name order by id) as varchar(24))
            end
from    YourTable

SQL Fiddle 中的示例。