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我有一个美国分销商销售的 MySQL 表。它包含每个位置（包括州）的邮寄地址。我被要求制作一份报告，其中将按地区列出分销商，例如太平洋、山区、中西部、中东北部、中大西洋、新英格兰、中西部、中南部、南大西洋和 AK & 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，以便当我执行查询以生成报告时，它会以一种优雅的方式组合在一起？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，它会有一个带有区域和州的记录布局，并且每个州会有一行。如果我走那条路，生成上述报告的查询会是什么样子？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    |
+----+--------------------+-------+
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1 回答 1

1

这里对您的表格描述有很大的猜测，但是像这样（未经测试）。希望这能让您了解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
于 2013-01-29T11:04:00.727 回答