此查询在Mysql 8下可以正常工作,但是我的服务器上使用了MariaDB 10.1。您知道是否有替代方法吗?以及如何实现呢?
SELECT * FROM (
SELECT
*,
SEC_TO_TIME(SUM(TIME_TO_SEC(TIMEDIFF(hs.`ending_hour`, hs.`starting_hour`))) OVER (ORDER BY hs.starting_hour RANGE BETWEEN INTERVAL '12' HOUR PRECEDING AND INTERVAL '12' HOUR following)) AS tot
FROM
time_table hs
WHERE hs.`starting_hour` > DATE_SUB(NOW(), INTERVAL 50 DAY) AND hs.`ending_hour` <= NOW()
ORDER BY hs.`starting_hour` ASC
) t1
HAVING tot >= '14:00:00'
;
问题是RANGE BETWEEN INTERVAL
上的OVER
窗口功能目前在MariaDB下不存在。
谢谢
样本数据:
id starting_hour ending_hour
------ ------------------- ---------------------
1 2018-09-02 06:00:00 2018-09-02 08:30:00
2 2018-09-02 08:30:00 2018-09-02 10:00:00
4 2018-09-03 11:00:00 2018-09-03 15:00:00
5 2018-09-04 15:30:00 2018-09-04 16:00:00
6 2018-09-04 16:15:00 2018-09-04 17:00:00
7 2018-09-19 00:00:00 2018-09-19 03:00:00
8 2018-09-19 04:00:00 2018-09-19 15:00:00
9 2018-09-20 00:00:00 2018-09-20 22:01:00
10 2018-10-21 12:00:00 2018-10-21 11:00:00
11 2018-10-29 09:09:00 2018-10-29 10:10:00
12 2018-10-09 02:10:00 2018-10-09 14:00:00
在我的用例ID 7、8和9中就是结果。
重新编辑
感谢@Gordon Linoff的答案,这是已更正的查询。
但是最终无法按预期工作。增加INTERVAL 50 DAY
会返回MySQL窗口功能不会返回的不需要的行。
SELECT hs.*,
(
SELECT SEC_TO_TIME(SUM(TIME_TO_SEC(TIMEDIFF(hs2.ending_hour, hs2.starting_hour))))
FROM hours_sailor hs2
WHERE hs2.starting_hour >= DATE_SUB(hs.starting_hour, INTERVAL 12 HOUR) AND hs2.starting_hour <= DATE_SUB(NOW(), INTERVAL 12 HOUR)
) AS duration
FROM `time_table` hs
WHERE hs.`starting_hour` > DATE_SUB(NOW(), INTERVAL 50 DAY) AND hs.`ending_hour` <= NOW()
HAVING duration >= '14:00:00'
ORDER BY hs.starting_hour ASC;
答案 0 :(得分:0)
您可以使用相关子查询来表达这一点。我认为这是等效的逻辑:
SELECT hs.*,
(SELECT SEC_TO_TIME(SUM(TIME_TO_SEC(TIMEDIFF(hs2.ending_hour, hs2.starting_hour)))
FROM time_table hs2
WHERE hs2.starting_hour >= hs.starting_hour - INTERVAL '12' HOUR AND
hs2.starting_hour <= hs.starting_hour + INTERVAL '12' HOUR
) AS tot
FROM time_table hs
WHERE hs.starting_hour > DATE_SUB(NOW(), INTERVAL 50 DAY) AND
hs.ending_hour <= NOW()
HAVING tot >= '14:00:00'
ORDER BY hs.starting_hour ASC;
编辑:
如果您还希望计算“范围”的时间限制,则需要将其包括在子查询中。该过滤功能内置于窗口功能中,但通常比功能障碍:
SELECT hs.*,
(SELECT SEC_TO_TIME(SUM(TIME_TO_SEC(TIMEDIFF(hs2.ending_hour, hs2.starting_hour)))
FROM time_table hs2
WHERE hs2.starting_hour >= hs.starting_hour - INTERVAL '12' HOUR AND
hs2.starting_hour <= hs.starting_hour + INTERVAL '12' HOUR AND
hs2.starting_hour > DATE_SUB(NOW(), INTERVAL 50 DAY) AND
hs2.ending_hour <= NOW()
) AS tot
FROM time_table hs
WHERE hs.starting_hour > DATE_SUB(NOW(), INTERVAL 50 DAY) AND
hs.ending_hour <= NOW()
HAVING tot >= '14:00:00'
ORDER BY hs.starting_hour ASC;