SQL Group By 和其他列的总和答案

【问题标题】：SQL Group By and sum of other columnSQL Group By 和其他列的总和
【发布时间】：2019-09-12 10:30:11
【问题描述】：

以下是原始表

+--------------+---------------+----------+---------+-----------+
| CustomerName | InvoiceNumber | ItemRate | TaxRate | TaxAmount |
+--------------+---------------+----------+---------+-----------+
| A            |             1 |      500 | 4%      | 20        |
| B            |             2 |      300 | 9%      | 27        |
| B            |             2 |      100 | 9%      | 9         |
| B            |             2 |      400 | 4%      | 16        |
| C            |             3 |      250 | 9%      | 22.5      |
| C            |             3 |      650 | 4%      | 26        |
| D            |             4 |      200 | 4%      | 8         |
| D            |             4 |      100 | 4%      | 4         |
+--------------+---------------+----------+---------+-----------+

我想要这样的输出：

+--------------+---------------+--------------+---------+-----------+
| CustomerName | InvoiceNumber | InvoiceTotal | TaxRate | TaxAmount |
+--------------+---------------+--------------+---------+-----------+
| A            |             1 |          500 | 4%      | 20        |
| B            |             2 |          800 | 9%      | 36        |
| B            |             2 |          800 | 4%      | 16        |
| C            |             3 |          900 | 9%      | 22.5      |
| C            |             3 |          900 | 4%      | 26        |
| D            |             4 |          300 | 4%      | 12        |
+--------------+---------------+--------------+---------+-----------+

在进行 Group By 时，我遇到了发票价值总和的问题。我必须使用“TaxRate”进行分组以组合类似的税收，并且我想在结果中包含新列，显示该特定发票的总计。

发票总计列应该包含整个发票的总和，因为我当前的查询是按税组而不是整个发票求和。

我的查询是：

Select CustomerName, InvoiceNumber, sum(itemrate) as InvoiceTotal, TaxRate, sum(TaxAmount) 
from salestable group by customername,invoicenumber, Taxrate

请帮助解决这个问题。

谢谢

【问题讨论】：

能否请您提供您的尝试？当我们没有您的 SQL 时，我们很难告诉您哪里出错了。
我更新了我的问题，请参阅问题中的“我的查询是：”部分。

标签： sql sql-server

【解决方案1】：

如果我理解正确，您想在每个客户的发票上加上 itemrate：

select CustomerName, InvoiceNumber,
       sum(sum(itemrate)) over (partition by CustomerName, InvoiceNumber) as InvoiceTotal,
       TaxRate,
       sum(TaxAmount) as TaxAmount
from salestable
group by customername, invoicenumber, Taxrate

【讨论】：

【解决方案2】：

试试这个-

WITH CTE AS
(
    SELECT CustomerName,SUM(ItemRate)  InvoiceTotal
    FROM your_table
    GROUP BY CustomerName
)

SELECT A.CustomerName,A.InvoiceNumber,B.InvoiceTotal,A.TaxRate,SUM(A.TaxAmount)
FROM your_table A
LEFT JOIN CTE B ON A.CustomerName = B.CustomerName
GROUP BY A.CustomerName,A.InvoiceNumber,B.InvoiceTotal,A.TaxRate
ORDER BY A.CustomerName,A.TaxRate DESC

【讨论】：

DV 几乎在我发布之前 ;)
为什么？这有效（尽管TaxRate 是相反的顺序）
ORDER BY 已添加 :) @Martin

【解决方案3】：

类似：

SELECT  tab.CustomerName,
        tab.InvoiceNumber,
        it.InvoiceTotal,
        tab.TaxRate,
        SUM(tab.TaxAmount) AS TaxAmount
  FROM tab
    INNER JOIN (
                SELECT InvoiceNumber, SUM(ItemRate) AS InvoiceTotal FROM tab GROUP BY InvoiceNumber
               ) it ON it.InvoiceNumber = tab.InvoiceNumber
  GROUP BY tab.CustomerName, tab.InvoiceNumber, it.InvoiceTotal, tab.TaxRate
  ORDER BY tab.CustomerName, tab.TaxRate DESC

查看关联的fiddle。

结果：

A   1   500 4   20
B   2   800 9   36
B   2   800 4   16
C   3   900 9   22.5
C   3   900 4   26
D   4   300 4   12

【讨论】：