Question

我正在尝试创建一个类似于序列号的东西，每行迭代一次，并在列shopID更改时重置。但我想使用变量。

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)

我需要得到这样的东西：

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，还应在分区后添加order by子句。

SQL自动计数器取决于列值

2 个答案: