Question

我在美国有一张MySQL经销商销售表。它包含每个位置的邮寄地址，包括州。我被要求编制一份报告，列出太平洋，山区，西北中部，东北中部，大西洋中部，新英格兰，西南中部，东南中部，南大西洋和AK＆amp;等地区的经销商; HI为AK_HI。

报告需要如下所示：

Region        State Average_Sales_by_state number_of_distributors
------        ----- ---------------------- ----------------------
Pacific       WA    $1234                  10
              OR    $4321                  20
              CA    $9876                  40
New England   ME    $1212                  15
              MA    $2222                  12
...

我如何在MySQL中处理这个问题，这样当我进行查询以生成报告时，它会以优雅的方式汇集在一起？此外，它需要按Average_Sales_by_state列的降序排序（我在上面的示例中没有这样做）。

我在想我应该创建一个名为US_Regions的新MySQL表，它将具有一个带有region＆amp;的记录布局。州，每个州都会有一排。如果我走这条路线，查询会产生什么样的报告，例如上面的报告？谢谢！

这是MySQL US_Regions表：

+----+--------------------+-------+
| id | Region             | State |
+----+--------------------+-------+
|  1 | Pacific            | WA    |
|  2 | Pacific            | OR    |
|  3 | Pacific            | CA    |
|  4 | Mountain           | MT    |
|  5 | Mountain           | ID    |
|  6 | Mountain           | WY    |
|  7 | Mountain           | NV    |
|  8 | Mountain           | UT    |
|  9 | Mountain           | CO    |
| 10 | Mountain           | AZ    |
| 11 | Mountain           | NM    |
| 12 | West North Central | ND    |
| 13 | West North Central | MN    |
| 14 | West North Central | SD    |
| 15 | West North Central | NE    |
| 16 | West North Central | IA    |
| 17 | West North Central | KS    |
| 18 | West North Central | MO    |
| 19 | East North Central | WI    |
| 20 | East North Central | IL    |
| 21 | East North Central | MI    |
| 22 | East North Central | IN    |
| 23 | East North Central | OH    |
| 24 | Middle Atlantic    | PA    |
| 25 | Middle Atlantic    | NY    |
| 26 | Middle Atlantic    | CT    |
| 27 | Middle Atlantic    | NJ    |
| 28 | New England        | NH    |
| 29 | New England        | VT    |
| 30 | New England        | ME    |
| 31 | New England        | MA    |
| 32 | New England        | RI    |
| 33 | West South Central | OK    |
| 34 | West South Central | AR    |
| 35 | West South Central | TX    |
| 36 | West South Central | LA    |
| 37 | East South Central | KY    |
| 38 | East South Central | TN    |
| 39 | East South Central | MS    |
| 40 | East South Central | AL    |
| 41 | South Atlantic     | WV    |
| 42 | South Atlantic     | VA    |
| 43 | South Atlantic     | NC    |
| 44 | South Atlantic     | SC    |
| 45 | South Atlantic     | GA    |
| 46 | South Atlantic     | FL    |
| 47 | South Atlantic     | DE    |
| 48 | South Atlantic     | MD    |
| 49 | South Atlantic     | DC    |
| 50 | Alaska-Hawaii      | AK    |
| 51 | Alaska-Hawaii      | HI    |
+----+--------------------+-------+

Answer 1

在你的表格描述中有非常大的猜测，但是这样的（未经测试）。希望这可以让您使用每个州一行的区域表。

SELECT b.Region, a.State, AVG(SaleValue) AS Average_Sales_by_state, COUNT(b.DistributorId)
FROM Sales a
INNER JOIN Distributors b ON a.DistributorId = b.DistributorId
INNER JOIN US_Regions c ON b.State = c.State
GROUP BY b.Region, a.State
ORDER BY b.Region, Average_Sales_by_state DESC

如何按区域在MySQL中对美国各州进行分组？

1 个答案: