Question

我有两张桌子：

**PRODUCTS**:  
*PART   ITEM*  
M1      A1  
M1      A2  
M1      A3  
M2      B1  
M2      B2  
M3      C1  
M3      C2  
...  

**PARTS**:
*PART   CODE*
M1      XYZ
M2      XYZ
M3      ABC
A1      XYZ
A2      MNO
A3      <null>
B1      <null>
B2      <null>
C1      <null>
...

基本上，我想通过
更新PARTS表中的空值 - 从PARTS.CODE中获取一个现有代码 - 其中PART.PART = PRODUCT.PART
- 在PRODUCT.ITEM上匹配PARTS.PART

到目前为止我所拥有的是：

update PARTS t2 
set t2.CODE =
  (
    select tx.CODE, t1.ITEM
    from PARTS tx
    join PRODUCTS t1
      on  tx.PART = t1.PART
  ) a
where t2.PART = a.ITEM
  and t2.CODE is null

内部选择会调出我需要的ITEM和CODE - 至少看起来它会在下面的'where'中匹配。我得到的错误是：
错误：ORA-00933：SQL命令未正确结束

非常感谢......

Answer 1

update PARTS t2 
set t2.CODE = (select max(tx.CODE) 
                 from PARTS tx join PRODUCTS t1 on tx.PART = t1.part
                where t2.part = t1.item
              )
where t2.CODE is null
  and exists(select 1 from PRODUCTS t1 where t1.item = t2.part and t2.part = t1.part);

带子查询别名的Oracle更新

1 个答案: