Question

我正在从cte更新但是遇到了这个常见错误 The multi-part identifier "t.newfips" could not be bound.我知道在其他情况下如何处理此错误，但在这种情况下我不知道如何处理。

我的查询

with t as (
select * from FIPSModificationsBEA t1
inner join [BEAtoFIPS] t2
on cast(t1.newfips as varchar) = concat(t2.statefips,t2.CountyFIPS)
)
update [BEAtoFIPS]
set statefips = left(t.oldfips, 2) , countyfips = right(t.oldfips, 3)
from [BEAtoFIPS] t2
where concat(t2.statefips, t2.countyfips) =  t.newfips
go

我通过以下查询检查了查询

with t as (
select * from FIPSModificationsBEA t1
inner join [BEAtoFIPS] t2
on cast(t1.newfips as varchar) = concat(t2.statefips,t2.CountyFIPS)
)
select newfips from t
go

此查询有效。因此，我很困惑。为什么后一个有效，但前一个没有？它们在结构上是否基本相同？前者出了什么问题？

Answer 1

您只需更新cte：

即可

with t as (
select * from FIPSModificationsBEA t1
inner join [BEAtoFIPS] t2
on cast(t1.newfips as varchar) = concat(t2.statefips,t2.CountyFIPS)
)
update t
set statefips = left(t.oldfips, 2) , countyfips = right(t.oldfips, 3)
go

否则加入cte

with t as (
select * from FIPSModificationsBEA t1
inner join [BEAtoFIPS] t2
on cast(t1.newfips as varchar) = concat(t2.statefips,t2.CountyFIPS)
)
update t2
set statefips = left(t.oldfips, 2) , countyfips = right(t.oldfips, 3)
from [BEAtoFIPS] t2
  inner join t
    on concat(t2.statefips, t2.countyfips) =  t.newfips
go

Answer 2

您的UPDATE查询没有CTE FROM的{{1}}条目（但您的t会这样做，这就是它运作的原因）。

考虑CTE的一种方法就像只能查看一个查询的临时视图。所以你有这样的（有点像）：

SELECT

在此示例中可能更明显的是Create View t (...) as ( select * from FIPSModificationsBEA t1 inner join [BEAtoFIPS] t2 on cast(t1.newfips as varchar) = concat(t2.statefips,t2.CountyFIPS) ) go update [BEAtoFIPS] set statefips = left(t.oldfips, 2) , countyfips = right(t.oldfips, 3) from [BEAtoFIPS] t2 where concat(t2.statefips, t2.countyfips) = t.newfips go实际上并未在t查询中的任何位置定义{。}}。

要解决此问题，您需要UPDATE到视图，告诉它如何连接到查询：

JOIN

CTE的查询需要与CTE完全相同 - update [BEAtoFIPS] set statefips = left(t.oldfips, 2) , countyfips = right(t.oldfips, 3) from [BEAtoFIPS] t2 join t on concat(t2.statefips, t2.countyfips) = t.newfips go并指定它与查询其余部分的关系。

Answer 3

您尚未在更新查询中加入CTE，因此t尚未分配。

试试这个：

WITH tempData AS (
    SELECT * FROM FIPSModificationsBEA t1
    INNER JOIN [BEAtoFIPS] t2
    ON CAST(t1.newfips as varchar) = CONCAT(t2.statefips,t2.CountyFIPS)
)

UPDATE t2
SET statefips = LEFT(t.oldfips, 2), 
    countyfips = right(t.oldfips, 3)
FROM [BEAtoFIPS] AS t2
INNER JOIN tempData AS t
    ON t.newFips = concat(t2.statefips, t2.countyfips)

但是你应该能够在没有cte的情况下做到这一点：

UPDATE b
SET statefips = LEFT(m.oldfips, 2), 
countyfips = RIGHT(m.oldfips, 3)
FROM [BEAtoFIPS] AS b
INNER JOIN FIPSModificationsBEA AS m
    ON CAST(m.newfips as varchar) = CONCAT(b.statefips,b.CountyFIPS)

从CTE问题更新

3 个答案: