SQL 自动计数器取决于列值

Question

我正在尝试创建一个序列号之类的东西，它在每一行上逐行迭代，并在列 shopID 更改时重置。但是我想用一个变量。

select 
   @Counter --what to do here?
   ,@data as Data
   ,case 
        when (ShopID.N.value('.', 'decimal(5,0)') = -1) then NULL 
        else ShopID.N.value('.', 'decimal(5,0)')
   end as ShopID 
 from @xmlRes.nodes('/Root/ResponseData/response/shopItems') as S(N)
    outer apply S.N.nodes('recordNumber') as ShopID(N)

我需要这样的东西：

Counter |   Data    |  ShopID
--------------------------------------
   1    |   Sample  |     1
   2    |   Sample  |     1
   3    |   Sample  |     1
   1    |   Sample  |     2
   2    |   Sample  |     2
   3    |   Sample  |     2
   4    |   Sample  |     2
   1    |   Sample  |     3

Answer 1

select 
    ROW_NUMBER() OVER (PARTITION BY ShopID ORDER BY Data) as Counter,
   ,@data as Data
   ,case 
        when (ShopID.N.value('.', 'decimal(5,0)') = -1) then NULL 
        else ShopID.N.value('.', 'decimal(5,0)')
   end as ShopID 
 from @xmlRes.nodes('/Root/ResponseData/response/shopItems') as S(N)
    outer apply S.N.nodes('recordNumber') as ShopID(N)

Answer 2

row_number() over (partition by ShopID)

如果您希望按特定顺序分配序列号，还应在分区依据后添加一个 order by 子句。

SQL 自动计数器取决于列值

SQL autocounter depending on a column value

sql

sql-server

xquery-sql