sql update table set - 无法绑定多部分标识符 [英] sql update table set - The multi-part identifier could not be bound

问题描述

我有 2 张桌子:

• 表 1 = 加油站名称(成对)
• Table2 = 包含坐标信息(经度和纬度等)

• Table1 = names of gas stations (in pairs)
• Table2 = has co-ordinate information (longitude and latitude amongst other things)

表 1 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

Table2 示例:

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

我想用 tableA 中的坐标信息更新这个表.我尝试按照 ​​SQL Server 执行以下操作2005:多部分标识符……无法绑定

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

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

我收到以下错误消息:

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

但是，如果我执行以下操作，它可以工作，然后我可以将其存储到另一个表中.

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

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)

我对 SQL 非常陌生，我很难理解为什么有些事情有效而其他事情却没有.根据我在上面发布的链接，我的初始查询应该有效 - 不是吗?也许我没有认真思考，因为我花了很多时间尝试这个，我终于得到了一位同事的帮助(她建议了我上面提到的方法).

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).

推荐答案

我认为您可以修改 UPDATE 语句以引用 UPDATE 行中的表别名.

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

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

这篇关于sql update table set - 无法绑定多部分标识符的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！