根据与之相同的另一列更改列中的字符串值

问题描述

我想更改一列中的值的名称，该值将基于同一行中另一列中的值。

我正在使用GROUP BY运算符，并使用CUBE关键字。

这是我用来创建表格的代码：

CREATE TABLE [dbo].[Purchase_Items]
(
    [ID] [int] NULL,[Model_Name] [varchar](50) NULL,[Brand] [varchar](50) NULL,[Price] [decimal](18,2) NULL,[PurchaseDate] [date] NULL
);

INSERT [dbo].[Purchase_Items] ([ID],[Model_Name],[Brand],[Price],[PurchaseDate]) 
VALUES (5,N'iPhone X',N'Apple',CAST(50000.00 AS Decimal(18,2)),CAST(N'2020-02-03' AS Date));

INSERT [dbo].[Purchase_Items] ([ID],[PurchaseDate]) 
VALUES (6,N'iPhone 11',CAST(70000.00 AS Decimal(18,CAST(N'2020-02-07' AS Date));

INSERT [dbo].[Purchase_Items] ([ID],[PurchaseDate]) 
VALUES (7,N'iPhone 6s',CAST(20000.00 AS Decimal(18,CAST(N'2020-02-10' AS Date));

INSERT [dbo].[Purchase_Items] ([ID],[PurchaseDate]) 
VALUES (8,N'iPhone 8',CAST(30000.00 AS Decimal(18,CAST(N'2020-02-21' AS Date));

INSERT [dbo].[Purchase_Items] ([ID],[PurchaseDate]) 
VALUES (13,N'Redmi 9',N'Xiaomi',CAST(10000.00 AS Decimal(18,CAST(N'2020-03-21' AS Date));

INSERT [dbo].[Purchase_Items] ([ID],[PurchaseDate]) 
VALUES (14,N'Redmi K30',CAST(25000.00 AS Decimal(18,CAST(N'2020-04-03' AS Date));

INSERT [dbo].[Purchase_Items] ([ID],[PurchaseDate]) 
VALUES (15,N'Mi Note 10',CAST(15000.00 AS Decimal(18,CAST(N'2020-04-21' AS Date));

INSERT [dbo].[Purchase_Items] ([ID],[PurchaseDate]) 
VALUES (16,N'BlackShark',CAST(N'2020-04-20' AS Date));

INSERT [dbo].[Purchase_Items] ([ID],[PurchaseDate]) 
VALUES (17,CAST(N'2020-04-22' AS Date));

INSERT [dbo].[Purchase_Items] ([ID],[PurchaseDate]) 
VALUES (18,CAST(N'2020-05-03' AS Date));

INSERT [dbo].[Purchase_Items] ([ID],[PurchaseDate]) 
VALUES (22,CAST(N'2020-05-21' AS Date));

INSERT [dbo].[Purchase_Items] ([ID],[PurchaseDate]) 
VALUES (23,N'BlackShark 3',CAST(N'2020-05-22' AS Date));

INSERT [dbo].[Purchase_Items] ([ID],[PurchaseDate]) 
VALUES (25,CAST(N'2020-05-10' AS Date));

这是我的查询：

SELECT month(PurchaseDate) Month,CASE WHEN month(PurchaseDate) is null then CONCAT('Grand Total for ',Brand) 
          ELSE COALESCE(Brand,'Monthly Subtotal') end AS Brand,SUM(Price) as 'Total Amount'
FROM Purchase_Items
GROUP BY CUBE(month(PurchaseDate),Brand)

这是输出：

Purchase Month   |         Brand           | Total Amount
---------------------------------------------------------
        3        |         Xiaomi          |   10000.00 
        4        |         Xiaomi          |   70000.00
        5        |         Xiaomi          |   30000.00
       NULL      |  Grand Total for Xiaomi |  110000.00
        2        |         Apple           |  170000.00
        4        |         Apple           |   70000.00
        5        |         Apple           |  170000.00
       NULL      |  Grand Total for Apple  |  410000.00           
       NULL      |    Grand Total for      |  520000.00
        1        |     Monthly Subtotal    |  250000.00
        2        |     Monthly Subtotal    |  200000.00
        3        |     Monthly Subtotal    |   70000.00

我想将“总计”更改为“总计”，但我不知道如何。

我在想是否可以根据“总计”列中的最高数字进行更改，因为它们共享同一行，但是也许还有其他方法可以解决此问题。

我该如何解决？

解决方法

测试类似

----------------------------------------
|                             value |
| metric | season | type |
------------------------------------
| metric1 |   A   | abc1.|     1
                               1
                               1
                               1
| metric2 |.  B   | abc1.|     2
                               2
                               2
                               2
| metric3 |.  A.  | def1 |     3
                               3
                               3
                               3
| metric4 |   B.  | def1 |     4
                               4
                               4
                               4
----------------------------------------

在第一种情况下-也许CASE WHEN month(PurchaseDate) IS NULL AND Brand IS NULL THEN 'Grand Total' WHEN month(PurchaseDate) IS NULL THEN CONCAT('Grand Total for ',Brand) ELSE COALESCE(Brand,'Monthly Subtotal') END AS Brand,就足够了？