如何組合2個SQL查詢並檢索累計計數？

Question

我在嘗試檢索特定A/B測試組合的每日訪問次數和轉化次數。每種組合代表A/B測試的不同變化。在這裏，我只使用'1'和'2'來表示變化，但技術上可能會有更多變化。

我寫了以下2個查詢，它們獨立工作。是否可以組合這些或編寫一個查詢來檢索我想要的數據？

訪問查詢：

SELECT DATE(visit.created), visit.combination, COUNT(visit.id) 
FROM visit 
WHERE visit.user_id = 6 
AND visit.experiment_id = 1 
GROUP BY DATE(visit.created), visit.combination 

考察的結果是：

轉換查詢：

SELECT DATE(conversion.created), conversion.combination, COUNT(conversion.id) 
FROM conversion 
WHERE conversion.user_id = 6 
AND conversion.experiment_id = 1 
AND conversion.goal_id = 1 
GROUP BY DATE(conversion.created), conversion.combination 

轉換的結果是：

另外，如果我能得到一個正在運行的總（累計）數，如下所示，請參見最後2列。我已經通過組合分組如下表，以便累積計數更容易理解：

+---------------+-------------+----------------------+-----------------+--------------+--------------+ 
| DATE(created) | combination | COUNT(conversion.id) | COUNT(visit.id) | cumulative_c | cumulative_v | 
+---------------+-------------+----------------------+-----------------+--------------+--------------+ 
| 2015-11-17 | 1   |     1 |    3 |   1 |   3 | 
| 2015-11-18 | 1   |     7 |    4 |   8 |   7 | 
| 2015-11-19 | 1   |     3 |    8 |   11 |   15 | 
| 2015-11-17 | 2   |     4 |    1 |   4 |   1 | 
| 2015-11-18 | 2   |     2 |    6 |   6 |   7 | 
| 2015-11-19 | 2   |     9 |    6 |   15 |   13 | 
+---------------+-------------+----------------------+-----------------+--------------+--------------+ 

數據庫模式：

Answer 1

結合很簡單：加0值列，再做UNION_ALL，然後組，總和。

SELECT dt, combination, SUM(v_count) as v_count, SUM(c_count) as c_count 
FROM 
(
SELECT DATE(visit.created) as dt, visit.combination as combination, COUNT(visit.id) as v_count, 0 as c_count 
FROM visit 
WHERE visit.user_id = 6 
AND visit.experiment_id = 1 
GROUP BY DATE(visit.created), visit.combination 

UNION ALL 

SELECT DATE(conversion.created) as dt, conversion.combination as combination, 0 as v_count, COUNT(conversion.id) as c_count 
FROM conversion 
WHERE conversion.user_id = 6 
AND conversion.experiment_id = 1 
AND conversion.goal_id = 1 
GROUP BY DATE(conversion.created), conversion.combination 
) as t 
GROUP BY dt, combination 

現在，運行總數。在更高級的DBMS中，這被稱爲「窗口」或「分析」功能。例如，在Oracle中，您可以這樣做：

SELECT dt, combination, SUM(v_count) OVER (PARTITION BY combination ORDER BY dt) as v_cumulative 

對於上述查詢，它會給你正是你想要的。但是，MySQL沒有這樣的功能。有方法，例如here和here，但它們非常複雜。

Answer 2

我希望這會有所幫助。

SELECT DATE(v.created), v.combination ,DATE(c.created), c.combination, COUNT(v.id), COUNT(c.id) FROM user u 
LEFT JOIN conversion c ON u.id = c.user_id 
LEFT JOIN visit v ON u.id = v.user_id 
WHERE c.id = 6 AND v.experiment_id = 1 AND c.goal_id = 1 
GROUP BY DATE(v.created), v.combination, DATE(c.created), c.combination