我正在尝试在 MYSQL 中构建一个查询来获取今天的记录,然后每小时计算出有多少条记录以及耗时。
示例数据:
Day Time Elapsed time
2015-01-28 9:00 0:53
2015-01-28 9:51 0:07
2015-01-28 10:32 1:45
2015-01-28 11:53 0:25
查询后的预期结果
Time Count Elapsed
7 0 0:0
8 0 0:0
9 2 1:00
10 1 1:45
11 1 0:25
12 0 0:0
13 0 0:0
14 0 0:0
15 0 0:0
16 0 0:0
17 0 0:0
因此,我们有 7 - 17 之间的每个小时以及有多少条记录以及该小时的耗时。
我目前有这个查询:
SELECT Date,
Count(Date) AS Count,
Sum(Elapsed) / 60 / 60 AS Elapsed,
avg(Elapsed) / 60 as average
FROM
telephone
WHERE
StartExt = 'E227'
AND EndExt = 'E227'
AND `Date` = CURDATE()
Group by Date ORDER BY Date ASC
它获取一整天的总时间和耗时,而不是分割为每个小时,我怎样才能实现这一点?
最佳答案
对于所有有数据的小时,您可以使用 hour()
函数:
SELECT hour(time) as hour, Count(Date) AS Count,
Sum(Elapsed) / 60 / 60 AS Elapsed, avg(Elapsed) / 60 as average
FROM telephone
WHERE StartExt = 'E227' AND EndExt = 'E227' AND `Date` = CURDATE()
Group by hour(time)
ORDER BY hour ASC
如果您需要在没有电话的情况下工作几个小时,则需要付出额外的努力。您需要一个包含所需所有时间的列表,然后需要一个左连接
。像这样的事情:
SELECT h.hh as hour, Count(time) AS Count,
Sum(Elapsed) / 60 / 60 AS Elapsed, avg(Elapsed) / 60 as average
FROM (select 7 as hh union all select 8 union all select 9 union all
. . .
select 17
) h left join
telephone t
on h.hh = hour(t.time) and
StartExt = 'E227' AND EndExt = 'E227' AND `Date` = CURDATE()
Group by h.hh
ORDER BY h.hh ASC
请注意,WHERE
条件已移至左外连接的 ON
子句。
关于php - MYSQL 查询计算每小时耗时,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/28191319/