[英]Add column as int count based on the occurrence of three other columns. How to use ROW_NUMBER with insert?
我需要一个额外的列来计算其他三列组合的唯一出现次数。 我可以使用 ROW_NUMBER 执行此操作,但想要更新表以存储值。
这可以看到它:
SELECT
ROW_NUMBER() OVER (PARTITION BY EntryDate, DocNo, Item ORDER BY EntryUID) AS x,
*
FROM
SourceTable
这不能更新它:
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:
消息 4104,级别 16,状态 1,第 17 行
无法绑定多部分标识符“TableA.EntryUID”
或者,如果您想使用原始方法,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
假设您正在运行 SQL Server,如错误消息所示,您可以简单地使用可更新的 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
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