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也许这对你们中的一些 MySQL 大师来说是一件容易的事，他们将这些东西视为 3 级儿童读物。

我有多个表要加入以生成报告的统计数据，而此刻我正试图弄清楚这一点。显然，这些数字必须正确，因为它会影响未来的许多决策。

这是土地的概况（不是全貌，但你会明白的）：

附属表

+----+-----------+------------+---------------------+
| id | firstname | lastname   | created_date        |
+----+-----------+------------+---------------------+
|  1 | Mike      | Johnson    | 2010-11-22 17:44:37 |
|  2 | Trevor    | Wilson     | 2010-12-23 16:24:24 |
|  3 | Bob       | Parker     | 2011-11-04 10:33:49 |
+----+-----------+------------+---------------------+

现在我们的查询应该只找到 Bob Parker (id 3) 的结果，所以我将只显示 Bob 的示例结果。

附属链接表

+-----+-----------+--------------+-----------+----------+---------------------+
| id  | parent_id | affiliate_id | link_type | linkhash | created_date        |
+-----+-----------+--------------+-----------+----------+---------------------+
|  21 |      NULL |            3 | PRODUCT   | fa2e82a7 | 2011-06-15 16:18:37 |
|  27 |      NULL |            3 | PRODUCT   | 55de2ae7 | 2011-06-23 01:03:00 |
|  28 |      NULL |            3 | PRODUCT   | 02cae72f | 2011-06-23 01:03:00 |
|  29 |        27 |            3 | PRODUCT   | a4dfb2c8 | 2011-06-23 01:03:00 |
|  30 |        28 |            3 | PRODUCT   | 72cea1b2 | 2011-06-23 01:03:00 |
|  36 |        21 |            3 | PRODUCT   | fa2e82a7 | 2011-06-23 01:07:03 |
|  59 |        21 |            3 | PRODUCT   | ec33413f | 2011-11-04 17:49:17 |
|  60 |        27 |            3 | PRODUCT   | f701188c | 2011-11-04 17:49:17 |
|  69 |        21 |            3 | PRODUCT   | 6dfb89fd | 2011-11-04 17:49:17 |
+-----+-----------+--------------+-----------+----------+---------------------+

会员统计

+--------+--------------+--------------------+----------+---------------------+
| id     | affiliate_id | link_id | order_id | type     | created_date        |
+--------+--------------+---------+----------+----------+---------------------+
|  86570 |            3 |      21 |     NULL | CLICK    | 2013-01-01 00:07:31 |
|  86574 |            3 |      21 |     NULL | PAGEVIEW | 2013-01-01 00:08:53 |
|  86579 |            3 |      21 |      411 | SALE     | 2013-01-01 00:09:52 |
|  86580 |            3 |      36 |     NULL | CLICK    | 2013-01-01 00:09:55 |
|  86582 |            3 |      36 |     NULL | PAGEVIEW | 2013-01-01 00:09:56 |
|  86583 |            3 |      28 |     NULL | CLICK    | 2013-01-01 00:11:04 |
|  86584 |            3 |      28 |     NULL | PAGEVIEW | 2013-01-01 00:11:04 |
|  86586 |            3 |      30 |     NULL | CLICK    | 2013-01-01 00:30:18 |
|  86587 |            3 |      30 |     NULL | PAGEVIEW | 2013-01-01 00:30:20 |
|  86611 |            3 |      69 |     NULL | CLICK    | 2013-01-01 00:40:19 |
|  86613 |            3 |      69 |     NULL | PAGEVIEW | 2013-01-01 00:40:19 |
|  86619 |            3 |      69 |      413 | SALE     | 2013-01-01 00:42:12 |
|  86622 |            3 |      60 |     NULL | CLICK    | 2013-01-01 00:46:00 |
|  86624 |            3 |      60 |     NULL | PAGEVIEW | 2013-01-01 00:46:01 |
|  86641 |            3 |      60 |     NULL | PAGEVIEW | 2013-01-01 00:55:58 |
|  86642 |            3 |      30 |      415 | SALE     | 2013-01-01 00:56:35 |
|  86643 |            3 |      28 |     NULL | PAGEVIEW | 2013-01-01 00:56:43 |
|  86644 |            3 |      60 |      417 | SALE     | 2013-01-01 00:56:52 |
+--------+--------------+---------+----------+----------+---------------------+

订单

+------+--------------+---------+---------------------+
| id   | affiliate_id | total   | created_date        |
+------+--------------+---------+---------------------+
|  411 |            3 |  138.62 | 2013-01-01 00:09:50 |
|  413 |            3 |  312.87 | 2013-01-01 00:09:52 |
|  415 |            3 |  242.59 | 2013-01-01 00:09:55 |
|  417 |            3 |  171.18 | 2013-01-01 00:09:55 |
+------+--------------+---------+---------------------+

现在我需要的结果应该是这样的（只显示主/父链接 id）

+---------+---------+
| link_id | total   |
+---------+---------+
|      21 |  451.49 | <- 1 order from parent (21), 1 from child (69)
|      27 |  171.18 | <- 1 order from child (69)
|      28 |  242.59 | <- 1 order from child (30)
+---------+---------+

我不太确定如何编写查询，以便我可以总结affiliate_link.id 和affiliate_link.parent_id 的组合位置。这甚至可以通过几个 JOIN 和 GROUPing 实现吗？

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1 回答 1

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我不太确定您为什么要进行非规范化affiliate_id（通过将其放在每个表中），因此，是否可以依靠源自特定链接的所有统计数据和订单与affiliate_id该链接相同。

如果可能的话，我建议更改AffiliateLink.parent_id列，使父记录指向自己（而不是NULL）：

UPDATE AffiliateLink SET parent_id = id WHERE parent_id IS NULL

然后就是一个简单的join和grouping的例子：

SELECT   AffiliateLink.parent_id AS link_id,
         SUM(Orders.total) AS total
FROM     AffiliateLink
    JOIN AffiliateStats ON AffiliateStats.link_id = AffiliateLink.id
    JOIN Orders         ON Orders.id = AffiliateStats.order_id
WHERE    AffiliateLink.affiliate_id = 3
GROUP BY AffiliateLink.parent_id

在sqlfiddle上查看。

如果无法进行更改，您可以使用以下方法有效地创建结果AffiliateLink表UNION（但要注意性能影响，因为 MySQL 将无法对结果使用索引）：

(
  SELECT parent_id, id, affiliate_id FROM AffiliateLink WHERE parent_id IS NOT NULL
UNION ALL
  SELECT id       , id, affiliate_id FROM AffiliateLink WHERE parent_id IS NULL
) AS AffiliateLink

在sqlfiddle上查看。

于 2013-01-22T07:48:12.687 回答