Question

我正在尝试使用OVER子句返回一行。我的代码如下：

SELECT SUM(Price) OVER (ORDER BY [InvoiceID] ROWS UNBOUNDED PRECEDING) 
FROM dbo.Sales 
WHERE InvoiceID = 3427

我想回来：

InvoiceID Price

3427      15.00

相反，返回的是：

InvoiceID    Price

3427    5.00

3427    10.00

3427     15.00

我如何获得一行？

Answer 1

不确定您使用OVER()子句的原因。似乎你只需要：

SELECT InvoiceID, Price = SUM(Price)
  FROM dbo.Sales 
  WHERE InvoiceID = 3427  -- maybe you want more than just this one?
                          -- if so, leave out the WHERE clause
  GROUP BY InvoiceID;

Answer 2

实际上，OVER子句中的窗口规范有三个主要部分：分区，排序和框架。窗口框架子句（ROWS BETWEEN AND）从两个指定分隔符之间的窗口分区过滤行的帧或子集。在您的查询中，未正确指定帧，它应该在分区的开头（即UNBOUNDED PRECEDING）和当前行（CURRENT ROW）之间。以下查询应该有所帮助：

SELECT SUM(Price) OVER (ORDER BY [InvoiceID] ROWS BETWEEN UNBOUNDED PRECEDING
AND CURRENT ROW) 
FROM dbo.Sales 
WHERE InvoiceID = 3427

SQL OVER运行总计选择一条记录

2 个答案: