使用CTE和行号作为序列进行更新,或使用行号()进行TSQL更新查询
我有一个名为使用CTE和行号作为序列进行更新,或使用行号()进行TSQL更新查询,sql,sql-server-2008,tsql,Sql,Sql Server 2008,Tsql,我有一个名为Site的表,其中包含列Name、SiteId和Sequence。我想用行号填充序列字段。我尝试了以下查询,但它只是不更新记录: WITH RowNumbers AS ( select SiteId, RowNum = row_number() OVER ( order by SiteId ) from [Site] ) UPDATE s SET s.[Sequence] = r.RowNum FROM [Si
Site
的表,其中包含列Name
、SiteId
和Sequence
。我想用行号填充序列
字段。我尝试了以下查询,但它只是不更新记录:
WITH RowNumbers AS
(
select SiteId,
RowNum = row_number() OVER ( order by SiteId )
from [Site]
)
UPDATE s
SET s.[Sequence] = r.RowNum
FROM [Site] as s INNER JOIN RowNumbers as r ON s.SiteId = r.Row
我做错了什么?你应该加入
r.SiteID
,而不是r.Row
WITH RowNumbers AS
(
select SiteId,
RowNum = row_number() OVER ( order by SiteId )
from [Site]
)
UPDATE s
SET s.[Sequence] = r.RowNum
FROM [Site] as s INNER JOIN RowNumbers as r ON s.SiteId = r.SiteID
您可以直接更新CTE
WITH RowNumbers AS
(
select *,
RowNum = row_number() OVER ( order by SiteId )
from [Site]
)
UPDATE RowNumbers
SET [Sequence] = RowNum
这与可更新视图的工作方式相同。我添加了
*
以确保更新的字段通过,然后直接更新它。哇。。。工作起来很有魅力。更具可读性。我不知道。太好了,正是我想要的!