Question

我有三个表，我试图通过连接所有表来生成报告。表打开：

id   |  offer_id   |  datetime
1    |  1          | 2017-08-19 00:00:00
2    |  1          | 2017-08-20 00:00:00
3    |  1          | 2017-08-20 00:00:00

表格点击：

id   |  offer_id   |  datetime
1    |  1          | 2017-08-20 00:00:00
2    |  1          | 2017-08-20 00:00:00
3    |  1          | 2017-08-20 00:00:00

表转换：

id   |  offer_id   |  datetime
1    |  1          | 2017-08-20 00:00:00
2    |  1          | 2017-08-21 00:00:00
3    |  1          | 2017-08-21 00:00:00

我需要构建一个查询，我可以获得如下所示的输出

需要输出：

datetime                 |  opens      |  clicks  | conversions
2017-08-19 00:00:00      |  1          | 0        | 0
2017-08-20 00:00:00      |  2          | 3        | 1
2017-08-21 00:00:00      |  0          | 0        | 2

到目前为止，我已经尝试了

SELECT count(DISTINCT opens.id) as opens,
count(DISTINCT clicks.id) as clicks,
count(DISTINCT conversions.id) as conversions
FROM opens

LEFT JOIN clicks
ON clicks.offer_id = 1

LEFT JOIN conversions
ON conversions.offer_id = 1

WHERE opens.offer_id = 1 GROUP BY DATE_FORMAT(opens.datetime, '%Y %M %D'), DATE_FORMAT(clicks.datetime, '%Y %M %D'), DATE_FORMAT(conversions.datetime, '%Y %M %D')

但是这个查询并没有给我所需的输出。请帮忙。

Answer 1

为了得到你想要的结果，它可能是一个复杂的SQL，如下所示，首先使用union从三个表中获取日期列表，然后在offer_id和date上与你的3个表进行左连接

SELECT groupdate,
COUNT(DISTINCT o.id) AS opens,
COUNT(DISTINCT c.id) AS clicks,
COUNT(DISTINCT con.id) AS conversions
FROM (
  SELECT offer_id,DATE_FORMAT(`datetime`, '%Y %M %D') groupdate FROM opens 
  UNION ALL
  SELECT offer_id,DATE_FORMAT(`datetime`, '%Y %M %D') groupdate FROM clicks
  UNION ALL
  SELECT offer_id,DATE_FORMAT(`datetime`, '%Y %M %D') groupdate FROM conversions
) t
LEFT JOIN opens o ON (t.offer_id = o.offer_id AND t.groupdate = DATE_FORMAT(o.`datetime`, '%Y %M %D'))
LEFT JOIN clicks c ON (t.offer_id = c.offer_id AND t.groupdate = DATE_FORMAT(c.`datetime`, '%Y %M %D'))
LEFT JOIN conversions con ON (t.offer_id = con.offer_id AND t.groupdate = DATE_FORMAT(con.`datetime`, '%Y %M %D'))
WHERE t.offer_id = 1 
GROUP BY groupdate

DEMO

从多个表中按日期分组的Php Sql组

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