[英]MySQL query to retrieve DISTINCT COUNT between moving DATE period
我正在嘗試編寫一個查詢,該查詢返回每個日期之前7天的日期列表和DISTINCT COUNT個用戶ID。 我正在使用的表很簡單,看起來像這樣:
Started UserId
"2012-09-25 00:01:04" 164382
"2012-09-25 00:01:39" 164382
"2012-09-25 00:02:37" 166121
"2012-09-25 00:03:35" 155682
"2012-09-25 00:04:18" 160947
"2012-09-25 00:08:19" 165806
我可以編寫單個COUNT輸出的查詢,如下所示:
SELECT COUNT(DISTINCT UserId)
FROM Session
WHERE Started BETWEEN '2012-09-18 00:00' AND '2012-09-25 00:00';
但是我想要做的是在表格和它之前的7天輸出這個COUNT。 為了澄清,9月25日的值將是18日到25日之間DISTINCT用戶ID的數量,第24和第24日之間的第24個等等。
我嘗試了以下查詢,但它每天只提供COUNT:
SELECT
DATE(A.Started),
Count(DISTINCT A.UserId)
FROM Session AS A
WHERE DATE(A.Started) BETWEEN DATE(DATE_SUB(DATE(DATE(A.Started)),INTERVAL 7 DAY)) AND DATE(DATE(A.Started))
GROUP BY DATE(A.Started)
ORDER BY DATE(A.Started);
輸出看起來像這樣:
DATE(A.Started) "Count(DISTINCT A.UserId)"
2012-09-18 709
2012-09-19 677
2012-09-20 658
2012-09-21 556
2012-09-22 530
2012-09-23 479
2012-09-24 528
2012-09-25 480
...
但正如我所說,這些只是每日計數。 最初我認為我可以將7天的值相加,但這將使DISTINCT子句無效。 我需要在給定日期之前的每7天的DISTINCT UserId計數。
此查詢應該適合您:
SELECT
DATE_FORMAT(d1.Started, '%Y-%m-%d') AS Started,
COUNT(DISTINCT d2.UserID) Users
FROM
(
SELECT
DATE(Started) AS Started
FROM
Session
GROUP BY
DATE(Started)
) d1
INNER JOIN
(
SELECT DISTINCT
DATE(Started) AS Started,
UserID
FROM
Session
) d2
ON d2.Started BETWEEN d1.Started - INTERVAL 7 DAY AND d1.Started
GROUP BY
d1.Started
ORDER BY
d1.Started DESC
訪問http://sqlfiddle.com/#!2/9339c/5以查看此查詢的實際效果。
嘗試:
Select Distinct Date(A.Started), Count(B.UserId)
From Session a
Join Session b
On b.Start Between AddDate(A.Start, day, -7) And A.Start
我不是MySQL人,所以語法可能不正確,但模式可行....
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