Question

我在表中有一个重复的字段，我想要做的是按顺序计算这个字段，例如下表

我想用以下

更新提交的“TEST”

我一直在研究下面这段代码，但它没有挑选出所有重复的内容，它只是将大部分内容都设为1。当我将代码作为选择运行时，它似乎工作得很好，就在我运行更新部分时。任何想法都会非常有用!!

with CTE as (
   SELECT ROW_NUMBER() OVER(PARTITION BY [ID] ORDER BY ([ID] ) ) AS Row#,
          [ID] 
   FROM [TABLE]
   WHERE [FIELD2 is not null  and FIELD3 is not null
)
update [TABLE]
set [TEST]= Row# 
from CTE
WHERE [TABLE].FIELD2 is not null 
  and [TABLE].FIELD3 is not null
  and CTE.ROW# = [TABLE].[ID];

Answer 1

您可以直接更新CTE：

with toupdate as (
      SELECT ROW_NUMBER() OVER (PARTITION BY ID ORDER BY ID) seqnum
             t.*
      FROM [TABLE] t
      WHERE FIELD2 is not null  and FIELD3 is not null
     )
update toupdate
    set TEST = seqnum
from CTE;

可更新的CTE是SQL Server的一个非常好的功能。

我实际上更喜欢分区子句中的ORDER BY (SELECT NULL)，因为这强调了排序并不重要。

Answer 2

您需要YourTable上的主键（PK）字段，以便知道哪一行分配Row#值。

with CTE as (
   SELECT ROW_NUMBER() OVER(PARTITION BY [ID] ORDER BY [ID] ) AS Row#,
          [ID],
          [table_pk]
   FROM [TABLE]
   WHERE [FIELD2 is not null  and FIELD3 is not null
)
UPDATE [TABLE]
SET [TEST]= Row# 
FROM CTE
WHERE [TABLE].[table_pk] = [CTE].[table_pk];

请注意，您不需要再次包含WHERE条件，因为您只加入了您在cte上找到的条件。

重复字段上的行计数

2 个答案: