除以返回 'Subquery returned more than 1 value.' 错误的子查询

Question

我有以下table，其中我有两个销售订单，每个销售订单都有不同数量的交易。

SaleOrder	Transaction	Amount
S1	T1	20
S1	T2	20
S2	T1	15
S2	T2	15
S2	T3	15

问题是我在 SQL 服务器 table 中获取每笔交易的总销售订单金额，而实际上它们需要在交易数量之间平均分配，如下所示：

SaleOrder	Transaction	Amount
S1	T1	10
S1	T2	10
S2	T1	5
S2	T2	5
S2	T3	5

我编写了以下查询：

SELECT SalesOrder,
     Transaction,
     Max(Amount) / (SELECT COUNT(Transaction) AS Transaction FROM Test_Table GROUP BY SalesOrder)
    FROM Test_Table
    GROUP BY SalesOrder,
        Transaction

但它给我 'Subquery returned more than 1 value. This is not permitted when the subquery follows =, !=, <, <=, >, >= or when the subquery is used as an expression.' 错误。有人可以解释这是什么以及如何纠正这个错误吗？

Answer 1

因为在子查询中你 GROUP BY SalesOrder 它 returns 每个 SalesOrder.
1 行但是你想要特定SalesOrder.
的交易数量使用 MAX() 和 COUNT() window 函数：

SELECT DISTINCT SalesOrder, Transaction, 
       MAX(Amount) OVER (PARTITION BY SalesOrder, Transaction) / 
       COUNT(*) OVER (PARTITION BY SalesOrder)
FROM Test_Table

如果列 Amount 的数据类型是 INTEGER 那么 SQL 服务器将执行整数除法，所以可能您需要先乘以 1.0 以便得到正确的结果带小数位的结果：

SELECT DISTINCT SalesOrder, Transaction, 
       1.0 * MAX(Amount) OVER (PARTITION BY SalesOrder, Transaction) / 
       COUNT(*) OVER (PARTITION BY SalesOrder)
FROM Test_Table

Answer 2

试试这个

SELECT SaleOrder, [Transaction]
    , Max(Amount) / COUNT([Transaction]) over (partition by SaleOrder)
FROM Test_Table GROUP BY SaleOrder,[Transaction]

Answer 3

我认为你不需要 group by，只是 window 功能：

SELECT SalesOrder, Transaction,
       Amount) / COUNT(*) OVER (PARTITION BY salesorder)
FROM Test_Table;

除以返回 'Subquery returned more than 1 value.' 错误的子查询

Divide by Subquery returning 'Subquery returned more than 1 value.' error

sql

tsql

sql-server

subquery

division