Question

我想基于查找表更新事实表。事实表的Addressid需要更新并替换为查询列的newaddress，并与查找表的oldaddress列进行比较。

我写了以下SQL语句：

Update [dbo].[fact_P] 
Set Address_Id = (Select AddressID_new 
                  From AddressLookup 
                  Where fact_P.Address_Id = Lookup.AddressID_old)

但它引发了错误。

Answer 1

您使用错误的别名/表名引用了子查询中的AddressID_old列。如果我没有弄错的话，您应该使用AddressLookup.Address_ID_old代替。

UPDATE [dbo].[fact_P]
SET Address_Id = (SELECT AddressID_new FROM AddressLookup al
                  WHERE fact_P.Address_Id = al.AddressID_old)

Answer 2

使用以下查询获取UPDATE语句：

  UPDATE [dbo].[fact_P] SET Address_Id = AddressID_new 
  FROM AddressLookup al
  WHERE fact_P.Address_Id = al.AddressID_old

Answer 3

in part，子查询仅在返回1值时才被允许。因此，如果我的表名没有错误，因为Lookup是'AddressLookup'，你需要加入：

Answer 4

Update tgt
set Address_Id = lu.Address_Id
from [dbo].[fact_P] tgt
inner join AddressLookup lu
on tgt.Address_Id = lu.AddressID_old;

SQL UPDATE语句出错

4 个答案: