使用SQL计算跨客户的运行计数和运行总计

Question

我有下表（SQL Server 2012）：

DID - cust id
GID - order id
AMT - order amt
Gf_Date - order date
SC - order reversal amount

我正在尝试计算客户的连续订单数量和销售总额，以便我可以为客户实现累计销售额$ 1,000的时间点分配标记。第一步，我运行以下查询：

Select
  [DID]
, [AMT]
, [Gf_Date]
, COUNT([GID]) OVER (PARTITION BY [DID] ORDER BY [Gf_Date]) [RunningGift_Count]
, SUM([AMT]) OVER (PARTITION BY [DID] ORDER BY [Gf_Date]) [CumlativeTotal]
FROM [dbo].[MCT]
WHERE [SC] is null
ORDER BY [DID]

但是我收到错误消息：

消息102，级别15，状态1，第3行'order'附近的语法不正确

我在较早时发布了此消息，并粘贴了错误的错误消息。遗憾和歉意。您在上面看到的是我得到的结果。有人评论说此语法不正确。现在一切正常，有人可以告诉我我做错了吗？

谁能帮我吗？在任何地方都找不到解决方案！谢谢！

Answer 1

您应该使用ROW_NUMBER（link）而不是COUNT：

DECLARE @Threshold NUMERIC(19,2)=1000; -- Use the same data type as `[AMT]`'s data type

Select
  [DID]
, [AMT]
, [Gf_Date]
--, COUNT([GID]) OVER (PARTITION BY [DID] ORDER BY [Gf_Date]) [RunningGift_Count]
, ROW_NUMBER() OVER (PARTITION BY [DID] ORDER BY [Gf_Date]) [RunningGift_Count]
, SUM([AMT]) OVER (PARTITION BY [DID] ORDER BY [Gf_Date]) [CumlativeTotal]
, CASE
      WHEN SUM([AMT]) OVER (PARTITION BY [DID] ORDER BY [Gf_Date]) >= @Threshold THEN 1
      ELSE 0
  END IsThresholdPassed
FROM [dbo].[MCT]
WHERE [SC] is null
ORDER BY [DID]