sql update table set - 无法绑定多部分标识符

I have 2 tables:

我有2张桌子:

Table1 = names of gas stations (in pairs)

表1 =加油站名称(成对)

Table2 = has co-ordinate information (longitude and latitude amongst other things)

表2 =有协调信息(经度和纬度等)

Example of Table1:

表1的示例:

StationID1  StationID2  Name1   Name2   Lattitude1  Longitude1  Lattitude2  Longitude2  Distance
------------------------------------------------------------------------------------------------
93353477    52452   FOO     BAR     NULL        NULL        NULL    NULL    NULL
93353527    52452   HENRY   BENNY   NULL        NULL        NULL    NULL    NULL
93353551    52452   GALE    SAM     NULL        NULL        NULL    NULL    NULL

Example of Table2:

表2的示例:

IDInfo     Name  Lattitude    Longitude
-------------------------------------------
93353477   BAR   37.929654    -87.029622

I want to update this table with the coordinate information which resides in tableA. I tried to do the following as per SQL Server 2005: The multi-part identifier … could not be bound

我想用表A中的坐标信息更新此表。我尝试按照SQL Server 2005执行以下操作:无法绑定多部分标识符....

update table1
set t1.[Lattitude1] = t2.[Lattitude]
from table1 t1
left join table2 t2 
on (t1.StationID1 = t2.IDInfo)

I get the following error message:

我收到以下错误消息:

Msg 4104, Level 16, State 1, Line 1
The multi-part identifier "t1.Lattitude1" could not be bound.

消息4104,级别16,状态1,行1无法绑定多部分标识符“t1.Lattitude1”。

However, if I do the following it works which I can then store into another table.

但是,如果我执行以下操作,则可以将其存储到另一个表中。

SELECT t1.[StationID1]
      ,t1.[StationID2]
      ,t1.[Name1]
      ,t1.[Name2]
        ,t2.[Lattitude] AS [Lattitude1]
        ,t2.[Longitude] AS [Longitude1]
        ,t3.[Lattitude] AS [Lattitude2]
        ,t3.[Longitude] AS [Longitude2]
from table1 t1
left join table2 t2 
on (t1.StationID1 = t2.IDInfo)
left join table2 t3 
on (t1.StationID2 = t2.IDInfo)

I am very new to SQL and am having a difficult time understanding why some things work and others don't. Based on the link I posted above my initial query should have worked - no? Perhaps I'm not thinking straight as I have spent many hours trying this and I finally got help from a co-worker (she suggested the approach I mention above).

我对SQL很陌生,很难理解为什么有些东西有效而有些东西没有用。基于我在上面发布的链接,我的初始查询应该有效 - 不是吗?也许我没有直接思考,因为我花了很多时间尝试这个,我终于得到了同事的帮助(她提出了我上面提到的方法)。

2 个解决方案

#1

I think you can modify your UPDATE statement to reference the table alias in the UPDATE line.

我认为您可以修改UPDATE语句以引用UPDATE行中的表别名。

update t1
set t1.[Lattitude1] = t2.[Lattitude]
from table1 t1
left join table2 t2 
on (t1.StationID1 = t2.IDInfo)

#2

You need to change the inner table and give a different allias to the columns that are similar. This should work.

您需要更改内部表并为相似的列提供不同的别名。这应该工作。

update table1
set [Lattitude1] = x.[lat]
from 
(
    SELECT IDInfo [id], Lattitude [lat] FROM 
    table2
) x
WHERE
StationID1 = x.[id]

In your particular case its not necessary to rename Lattitude to lat, but if you end up updating a table with itself and force yourself into giving the columns different names, it will save you headaches down the road.

在您的特定情况下,没有必要将Lattitude重命名为lat,但如果您最终使用自身更新表并强制自己为列提供不同的名称,它将为您节省麻烦。

#1