根据其他三个列的出现将列添加为 int 计数。如何使用 ROW_NUMBER 插入？

Question

我需要一个额外的列来计算其他三个列的组合的唯一出现次数。我可以用 ROW_NUMBER 做到这一点，但我想更新 table 来存储这些值。

这个作品看看吧：

SELECT
    ROW_NUMBER() OVER (PARTITION BY EntryDate, DocNo, Item ORDER BY EntryUID) AS x, 
    *
FROM
    SourceTable

无法更新它：

WITH TableA AS 
(
    SELECT
        ROW_NUMBER() OVER (PARTITION BY EntryDate, DocNo, Item ORDER BY EntryUID) AS x,
        *
    FROM 
        SourceTable
)
UPDATE SourceTable
SET SourceTable.NEWCount = TableA.x
WHERE SourceTable.EntryUID = TableA.EntryUID

我收到此错误消息：

Msg 4104, Level 16, State 1, Line 17
The multi-part identifier "TableA.EntryUID" could not be bound

Answer 1

假设你是运行 SQL 服务器，如错误信息所示，你可以简单地使用一个可更新的 CTE：

with cte as (
    select newcount, 
        row_number () over(partition by entrydate, docno, item order by entryuid ) as rn
    from sourcetable
)
update cte set newcount = rn

Answer 2

或者，如果您想使用原来的方法，则需要在 UPDATE 语句中包含 CTE - 如下所示：

WITH TableA AS 
(
    SELECT
        ROW_NUMBER() OVER (PARTITION BY EntryDate, DocNo, Item ORDER BY EntryUID) AS x,
        *
    FROM 
        SourceTable
)
UPDATE src
SET NEWCount = TableA.x
FROM SourceTable src
INNER JOIN TableA ON src.EntryUID = TableA.EntryUID

根据其他三个列的出现将列添加为 int 计数。如何使用 ROW_NUMBER 插入？

Add column as int count based on the occurrence of three other columns. How to use ROW_NUMBER with insert?

sql

sql-update

row-number