使用相同的主键将值从一行添加到另一行 - Oracle SQL

Posted 2023-05-09

【中文标题】使用相同的主键将值从一行添加到另一行 - Oracle SQL

【英文标题】：Add Value from one Row to another Row with Same Primary Key- Oracle SQL

【发布时间】：2020-02-28 15:45:40

【问题描述】：

我想创建一个更新语句，将一行中的值添加到具有相同 ID 字段的另一行的值中。基本上只要 TYPE = 'ASB' 和 TEMP = 'DELETE' 我想将 AMOUNT 值添加到 TYPE = 'CON' 的 AMOUNT 中。

必须为每个 ID 执行此操作。 COMBINE 字段可以用作每一行的唯一标识符。也许是一个窗口功能？非常感谢任何帮助！

Current Result:
ID          TYPE         AMOUNT        COMBINE      TEMP
0432        CMP         12828.77      0432CMP   
0432        CON         -2083.26      0432CON   
0432        ASB         1704.03       0430ASB      DELETE

Expected Result:
ID          TYPE         AMOUNT        COMBINE      TEMP
0432        CMP         12828.77      0432CMP   
0432        CON         -379.23       0432CON   
0432        ASB         1704.03       0432ASB      DELETE

【参考方案1】：

您可以使用MERGE声明如下：

MERGE INTO YOUR_TABLE TRG USING 
(
    SELECT ID, SUM(AMOUNT) AS AMOUNT
    FROM YOUR_TABLE
    WHERE TYPE = 'ASB' AND TEMP = 'DELETE'
    GROUP BY ID
) SRC 
ON ( SRC.ID = TRG.ID AND TRG.TYPE = 'CON' )
WHEN MATCHED THEN 
UPDATE SET TRG.AMOUNT = TRG.AMOUNT + SRC.AMOUNT;

干杯！！

【参考方案2】：

update 应该这样做：

update t
    set amount = amount +
                 (select coalesce(sum(t2.amount), 0)
                  from t t2
                  where t2.id = t.id and t2.type = 'ASB' and t2.temp = 'DELETE'
                 )
    where t.type = 'CON' and
          exists (select 1
                  from t t2
                  where t2.id = t.id and t2.type = 'ASB' and t2.temp = 'DELETE'
                 );