Sql 除以返回的子查询'；子查询返回的值超过1个；错误

我有下表，其中我有两个销售订单，每个销售订单有不同数量的交易

销售订单 交易 数量 S1 T1 20 S1 T2 20 S2 T1 15 S2 T2 15 S2 T3 15

---

因为在子查询中，您按SalesOrder对

进行分组

它会为每个

SalesOrder

返回一行 但是您需要特定

销售订单的交易数量


使用MAX（）和COUNT（）窗口函数：

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

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

如果列
Amount
的数据类型为整数，则SQL Server将执行整数除法，因此您可能需要先乘以
1.0
，以便得到正确的小数位结果：

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

试试这个

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

我认为您不需要分组方式，只需要窗口功能：

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

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