在SQL中用一行数据透视表

我有一份每周报告，在那里我必须分享我们的表现。我有以下疑问

SELECT COUNT(*) AS Transactions,
COUNT(DISTINCT id) as Customers,
SUM(CASE WHEN Product in ('Paper','Pen','Eraser') THEN 1 ELSE 0 END) School_Supplies,
SUM(CASE WHEN Product in ('Paper','Pen','Eraser') THEN Payment ELSE 0 END) AS School_Supplies_Revenue
FROM dbo.Transactions

这给了我一张桌子

Transactions | Customers | School_Supplies | School_Supplies_Revenue
12845        |  9654     |  1546           |  8745

我希望桌子能像这样旋转

KPI                      | Value
Transactions             | 12845
Customers                | 9654
School_Supplies          | 1546
School_Supplies_Revenue  | 8745

我试着使用UNPIVOT，但不起作用。如何透视此表，使列名及其各自的值成为数据点

我的数据库如下所示：

[ID] | [Product] | [Cost per Item] | [Payment] | [Transaction Date]
001  | Paper     |  2.15           |  5.54     | 2021-01-12

---

在SQL Server中，最简单的方法可能是

apply

：

SELECT v.*
FROM (SELECT COUNT(*) AS Transactions,
             COUNT(DISTINCT id) as Customers,
             SUM(CASE WHEN Product in ('Paper','Pen','Eraser') THEN 1 ELSE 0 END) as School_Supplies,
            SUM(CASE WHEN Product in ('Paper','Pen','Eraser') THEN Payment ELSE 0 END) AS School_Supplies_Revenue
      FROM dbo.Transactions t
     ) t CROSS APPLY
     (VALUES ('Transactions', Transactions),
             ('Customers', customers),
             ('School_Supplies', School_Supplies),
             ('School_Supplies_Revenue', School_Supplies_Revenue)
     ) v(kpi, value);

---

用您正在使用的数据库标记您的问题。

dbo.Transactions

表明它是。这也是Microsoft SQL Server用户将其数据库称为“SQL”的自定义设置，就像没有其他人使用该术语一样。这正是我所需要的，非常感谢。