当我有一个联接表时，如何查询总数

问题描述

| 哈o 我有一个连接表，说的是tableA和tableB。 tableA有一个称为Amount的列。 tableB有一列称为refID。当refID具有相同的值时，我想总计Amount列。我在查询中使用了SUM，但它抛出了一个错误：

ORA-30483: window  functions are not allowed here
30483. 00000 -  \"window  functions are not allowed here\"
*Cause:    Window functions are allowed only in the SELECT list of a query.
           And,window function cannot be an argument to another window or group
           function.

这是我的查询供您参考：

select *
from (
       select SUM(A.Amount),B.refId,Rank() over (partition by B.refID order by B.id desc) as ranking
       from table A
       left outer join table B on A.refID = B.refID
)
where ranking=1;

我可以知道是否还有其他解决方案可以让我求和？ 谢谢 @！     

解决方法

SELECT  *
FROM    (
        SELECT  A.Amount,B.refId,Rank() over (partition by A.refID order by B.id desc) as ranking,SUM(amount) OVER (PARTITION BY a.refId) AS asum
        FROM    tableA A
        LEFT JOIN
                tableB B
        ON      B.refID = A.refID
        )
WHERE   ranking = 1

    ,

select 
  SUM(A.Amount),B.refId
from table A
  left outer join table B on A.refID = B.refID
GROUP BY 
  B.refId

    ,

  Declare @T table(id int) 
    insert into @T values (1),(2)
  Declare @T1 table(Tid int,fkid int,Amount int)
    insert into @T1 values (1,1,200),(2,250),(3,2,100),(4,25)

    Select SUM(t1.Amount) as amount,t1.fkid as id from @T t
 left outer join @T1 t1 on t1.fkid = t.id group by t1.fkid

    ,

SELECT refid,sum(a.amount)
FROM table AS a LEFT table AS b USING (refid)
GROUP BY refid;

    ,我有点困惑。您发布的查询在任何地方都没有SUM函数，并对其自身执行了名为““ TABLE \”的表的自联接。我猜您实际上有两个表（我将它们称为TABLE_A和TABLE_B），在这种情况下，应执行以下操作：

SELECT a.REFID,SUM(a.AMOUNT)
  FROM TABLE_A a
  INNER JOIN TABLE_B b
    ON (b.REFID = a.REFID)
  GROUP BY a.REFID;

如果我理解您的问题，则仅当您拥有与TABLE_A.REFID匹配的TABLE_B.REFID时才需要结果，因此使用INNER JOIN是合适的。 分享并享受。