Oracle SQL - 基于 concat 的外连接

Oracle SQL - Outer join based on concat

我需要交叉连接两个表,但连接条件是:

Select FutureInventory.Item,
       To_Number(Concat(Location, Channel_Id)) Location,
  From V_CUST_FUTURE_INV_POSITION FutureInventory,
       xx_Item_Loc_Info_V         ItemLoc
 Where FutureInventory.Item(+) = ItemLoc.Item
   And To_Number(Concat(Location, Channel_Id))(+) = ItemLoc.Loc;

我想将列 To_Number(Concat(Location, Channel_Id)) 外连接到 ItemLoc.Loc (+) 号放在哪里

要在 Oracle 中执行外部联接,您可以使用适当的 JOIN 类型——就像在所有其他数据库中一样。我认为你想要的逻辑是:

select FutureInventory.Item,
       To_Number(Concat(Location, Channel_Id)) as Location,
from xx_Item_Loc_Info_V ItemLoc LEFT JOIN
     V_CUST_FUTURE_INV_POSITION FutureInventory,
     on FutureInventory.Item = ItemLoc.Item AND
        To_Number(Concat(Location, Channel_Id)) = ItemLoc.Loc;

首先,使用显式连接语法 - 旧的 (+) 难以阅读且容易出错。其次,使用 || 运算符而不是 CONCAT 函数 - 同样,更易于阅读。所以我们最终得到

Select FutureInventory.Item,
       To_Number(Location || Channel_Id) Location,
  From xx_Item_Loc_Info_V ItemLoc
  LEFT OUTER JOIN V_CUST_FUTURE_INV_POSITION FutureInventory,
    ON FutureInventory.Item = ItemLoc.Item And
       To_Number(Location || Channel_Id) = ItemLoc.Loc