Question

您是否可以将我的问题视为重复，但我没有从其中任何一个获得答案，或者我无法创建查询。

我有一张如下表格。

---------------------------------------------------------------------------------
|    Customer Name    |    Date    |  Product Name  |  Qty  |  Rate  |  Amount  |
---------------------------------------------------------------------------------
|  Customer1          | 10/10/2014 |  Product1      |   10  | 100.00 | 1000.00  |
|  Customer1          | 12/10/2014 |  Product1      |    1  |   0.00 |    0.00  |
|  Customer2          | 14/10/2014 |  Product1      |   10  | 100.00 | 1000.00  |
|  Customer1          | 16/10/2014 |  Product1      |   10  | 100.00 | 1000.00  |
|  Customer2          | 16/10/2014 |  Product2      |   10  | 100.00 | 1000.00  |
|  Customer2          | 16/10/2014 |  Product2      |    1  |   0.00 |    0.00  |
|  Customer1          | 20/10/2014 |  Product2      |   20  | 150.00 | 1500.00  |
---------------------------------------------------------------------------------

我想显示如下结果......

---------------------------------------------------------
|    Customer Name    |  Product Name  |  Qty  |  Free  |
---------------------------------------------------------
|  Customer1          |  Product1      |   20  |      1 |
|  Customer1          |  Product2      |   20  |      0 |
|  Customer2          |  Product1      |   10  |      0 |
|  Customer2          |  Product2      |   10  |      1 |
---------------------------------------------------------

这意味着在日期范围内根据Qty / Rate将Amount列拆分为两个。

在我的程序中，我使用将免费数量保存为0.00费率。

我已经看过并尝试了很多流程但却失败了。

我的SQL查询如下所示。

SELECT CustomerName,ProductName,SUM(Qty), CASE WHEN Rate > 0 AND Amount > 0, CASE WHEN Rate < 1 AND Amount < 1 FROM salesdetails WHERE InvoiceDate BETWEEN '02/11/2014' AND '13/11/2014' GROUP BY ProductId, SoldTo ORDER BY CustomerName ASC

但它显示错误。

当我尝试......

SELECT CustomerName,ProductName,SUM(Qty) FROM salesdetails WHERE InvoiceDate BETWEEN '" & dtt & "' AND '" & dtf & "' AND Rate > 0 AND Amount > 0 GROUP BY ProductId, CustomerName ORDER BY CustomerName ASC

它显示单列（SUM(Qty)）中的记录跳过免费数量（Rate = 0），因为我已经编写了查询来执行此操作。

查询应该是什么？

请帮我解决这个问题。

此致

Answer 1

经过测试和工作：

SELECT Customer, 
       Product, 
       SUM(IF(Rate>0,Qty,0)) AS Qty, 
       SUM(IF(Rate=0,Qty,0)) AS Free
FROM salesdetails 
WHERE InvoiceDate BETWEEN '02/10/2014' AND '13/11/2014'
GROUP BY Customer, Product;

MySQL将单个列数据拆分为两列

1 个答案: