SQL 在获取过去 24 小时内的记录数的同时累积前几天的结果答案

【问题标题】：SQL accumulates previous days results while getting number of records in past 24 hoursSQL 在获取过去 24 小时内的记录数的同时累积前几天的结果
【发布时间】：2019-12-31 05:16:50
【问题描述】：

我编写了这个 SQL 查询，它返回过去 24 小时内每小时创建的记录数。该查询在第一天运行良好，但从第二天开始，它将第一天的记录数与当天计数相加。

这是我当前的查询：

 select h.hr, count(e.eventID) as cnt
from (
    select 0 hr union all select 1 union all select 2 union all select 3 union all select 4 union all select 5 union all select 6 union all select 7 union all select 8 union all select 9 union all select 10 union all select 11 union all select 12 union all select 13 union all select 14 union all select 15 union all select 16 union all select 17 union all select 18 union all select 19 union all select 20 union all select 21 union all select 22 union all select 23
) h
left join events e 
    on e.timeStamp > now() - interval 24 hour
        and hour(e.timeStamp) = h.hr
group by h.hr

我的数据集：

+---------+----------+---------------------+---------------------+
| eventID | personID | timeStamp           | dateModified        |
+---------+----------+---------------------+---------------------+
|       1 |        8 | 2019-12-28 12:26:49 | 2019-12-28 12:26:50 |
|       2 |        0 | 2019-12-28 12:26:51 | 2019-12-28 12:26:52 |
|       3 |        0 | 2019-12-28 12:27:11 | 2019-12-28 12:27:12 |
|       4 |        0 | 2019-12-28 12:27:12 | 2019-12-28 12:27:12 |
|       5 |        0 | 2019-12-28 12:28:20 | 2019-12-28 12:28:20 |
|       6 |        0 | 2019-12-28 12:28:21 | 2019-12-28 12:28:21 |
|       7 |        0 | 0000-00-00 00:00:00 | 2019-12-28 12:28:21 |
|       8 |        2 | 2019-12-28 12:30:02 | 2019-12-28 12:30:02 |
|       9 |        0 | 2019-12-28 12:30:03 | 2019-12-28 12:30:03 |
|      10 |        1 | 2019-12-30 05:38:02 | 2019-12-30 05:38:01 |
|      11 |        0 | 2019-12-30 05:38:05 | 2019-12-30 05:38:03 |
|      12 |        0 | 2019-12-30 05:41:42 | 2019-12-30 05:41:41 |
|      13 |        1 | 2019-12-30 05:41:41 | 2019-12-30 05:41:41 |
|      14 |        1 | 2019-12-30 05:43:11 | 2019-12-30 05:43:11 |
|      15 |        0 | 2019-12-30 05:43:13 | 2019-12-30 05:43:11 |
|      16 |        8 | 2019-12-30 05:44:08 | 2019-12-30 05:44:08 |
|      17 |        0 | 2019-12-30 05:44:10 | 2019-12-30 05:44:08 |
|      18 |        1 | 2019-12-30 05:48:06 | 2019-12-30 05:48:06 |
|      19 |        0 | 2019-12-30 05:48:08 | 2019-12-30 05:48:07 |
|      20 |        1 | 2019-12-30 06:09:58 | 2019-12-30 06:09:57 |
|      21 |        0 | 2019-12-30 06:10:00 | 2019-12-30 06:09:58 |
|      22 |        0 | 2019-12-30 06:11:22 | 2019-12-30 06:11:20 |
|      23 |        1 | 2019-12-30 06:11:20 | 2019-12-30 06:11:20 |
|      24 |        1 | 2019-12-30 06:13:30 | 2019-12-30 06:13:30 |
|      25 |        0 | 2019-12-30 06:13:32 | 2019-12-30 06:13:30 |
|      26 |        0 | 0000-00-00 00:00:00 | 2019-12-30 06:13:42 |
|      27 |        0 | 0000-00-00 00:00:00 | 2019-12-30 06:14:00 |
|      28 |        1 | 2019-12-30 06:14:55 | 2019-12-30 06:14:54 |
|      29 |        0 | 2019-12-30 06:14:57 | 2019-12-30 06:14:55 |
|      30 |        0 | 0000-00-00 00:00:00 | 2019-12-30 06:14:59 |
|      31 |        8 | 2019-12-30 06:16:22 | 2019-12-30 06:16:22 |
|      32 |        0 | 2019-12-30 06:16:24 | 2019-12-30 06:16:22 |
|      33 |        0 | 0000-00-00 00:00:00 | 2019-12-30 06:16:27 |
|      34 |        8 | 2019-12-30 06:17:56 | 2019-12-30 06:17:56 |
|      35 |        0 | 2019-12-30 06:17:58 | 2019-12-30 06:17:56 |
|      36 |        1 | 2019-12-30 06:18:32 | 2019-12-30 06:18:31 |
|      37 |        0 | 2019-12-30 06:18:33 | 2019-12-30 06:18:31 |
|      38 |        0 | 0000-00-00 00:00:00 | 2019-12-30 06:18:37 |
|      39 |        8 | 2019-12-30 06:21:23 | 2019-12-30 06:21:23 |
|      40 |        0 | 2019-12-30 06:21:25 | 2019-12-30 06:21:23 |
|      41 |        0 | 2019-12-30 06:21:33 | 2019-12-30 06:21:32 |
|      42 |        0 | 2019-12-30 06:21:34 | 2019-12-30 06:21:32 |
|      43 |        1 | 2019-12-30 06:39:58 | 2019-12-30 06:39:57 |
|      44 |        0 | 2019-12-30 06:40:00 | 2019-12-30 06:39:59 |
|      45 |        1 | 2019-12-30 06:40:29 | 2019-12-30 06:40:29 |
|      46 |        0 | 2019-12-30 06:40:31 | 2019-12-30 06:40:29 |
|      47 |        1 | 2019-12-30 06:42:06 | 2019-12-30 06:42:05 |
|      48 |        0 | 2019-12-30 06:42:07 | 2019-12-30 06:42:05 |
|      49 |        1 | 2019-12-30 06:44:21 | 2019-12-30 06:44:20 |
|      50 |        0 | 2019-12-30 06:44:22 | 2019-12-30 06:44:21 |
|      51 |        1 | 2019-12-30 06:45:35 | 2019-12-30 06:45:34 |
|      52 |        0 | 2019-12-30 06:45:36 | 2019-12-30 06:45:34 |
|      53 |        1 | 2019-12-30 06:46:27 | 2019-12-30 06:46:27 |
|      54 |        0 | 2019-12-30 06:46:28 | 2019-12-30 06:46:27 |
|      55 |        1 | 2019-12-30 06:50:40 | 2019-12-30 06:50:39 |
|      56 |        0 | 2019-12-30 06:50:41 | 2019-12-30 06:50:39 |
|      57 |        8 | 2019-12-30 08:10:52 | 2019-12-30 08:10:57 |
|      58 |        0 | 2019-12-30 08:10:59 | 2019-12-30 08:10:58 |
|      59 |        1 | 2019-12-30 09:47:06 | 2019-12-30 09:47:07 |
|      60 |        0 | 2019-12-30 09:47:08 | 2019-12-30 09:47:07 |
|      61 |        1 | 2019-12-30 11:43:17 | 2019-12-30 11:43:17 |
|      62 |        0 | 2019-12-30 11:43:18 | 2019-12-30 11:43:18 |
|      63 |        1 | 2019-12-30 11:43:35 | 2019-12-30 11:43:35 |
|      64 |        0 | 2019-12-30 11:43:36 | 2019-12-30 11:43:35 |
|      65 |        1 | 2019-12-30 11:44:05 | 2019-12-30 11:44:05 |
|      66 |        0 | 2019-12-30 11:44:06 | 2019-12-30 11:44:06 |
|      67 |        1 | 2019-12-30 12:26:47 | 2019-12-30 12:26:47 |
|      68 |        0 | 2019-12-30 12:26:49 | 2019-12-30 12:26:48 |
|      69 |        0 | 2019-12-30 12:40:34 | 2019-12-30 12:40:33 |
|      70 |        1 | 2019-12-30 12:40:33 | 2019-12-30 12:40:34 |
|      71 |        8 | 2019-12-31 04:52:29 | 2019-12-31 04:52:28 |
|      72 |        0 | 2019-12-31 04:52:31 | 2019-12-31 04:52:29 |
|      73 |        0 | 2019-12-31 04:53:50 | 2019-12-31 04:53:47 |
|      74 |        8 | 2019-12-31 04:53:48 | 2019-12-31 04:53:47 |
|      75 |        8 | 2019-12-31 04:54:14 | 2019-12-31 04:54:13 |
|      76 |        0 | 2019-12-31 04:54:16 | 2019-12-31 04:54:14 |
|      77 |        8 | 2019-12-31 04:54:40 | 2019-12-31 04:54:38 |
|      78 |        0 | 2019-12-31 04:54:41 | 2019-12-31 04:54:39 |
|      79 |        0 | 2019-12-31 04:55:11 | 2019-12-31 04:55:09 |
|      80 |        8 | 2019-12-31 04:55:10 | 2019-12-31 04:55:10 |
+---------+----------+---------------------+---------------------+

我哪里错了？

如果有人需要，这是我的时间戳格式：2019-12-31 04:55:10

P.S：我的 sql 不支持递归 CTE，所以我不得不使用 union 24 次。

【问题讨论】：

Shrihari，您能否在表格事件中发布数据样本，以便我们可以在我们这边进行测试？
当然。给我一分钟。
@zip 我已经添加了我的数据集。

标签： mysql sql database mariadb

【解决方案1】：

我没有测试数据，但你需要的是这种寒冷：

 select h.hr, count(e.eventID) as cnt
from (
    select 0 hr union all select 1 union all select 2 union all select 3 union all select 4 union all select 5 union all select 6 union all select 7 union all select 8 union all select 9 union all select 10 union all select 11 union all select 12 union all select 13 union all select 14 union all select 15 union all select 16 union all select 17 union all select 18 union all select 19 union all select 20 union all select 21 union all select 22 union all select 23
) h
left join (select * from events e where e.timeStamp > now() - interval 24 hour) e
        on hour(e.timeStamp) = h.hr
group by h.hr

如果

select * from events e where e.timeStamp > now() - interval 24 hour

只为您提供过去 24 小时的记录

如果您想要最后一天的事件：

select h.hr, count(e.eventID) as cnt
from (
    select 0 hr union all select 1 union all select 2 union all select 3 union all select 4 union all select 5 union all select 6 union all select 7 union all select 8 union all select 9 union all select 10 union all select 11 union all select 12 union all select 13 union all select 14 union all select 15 union all select 16 union all select 17 union all select 18 union all select 19 union all select 20 union all select 21 union all select 22 union all select 23
) h
left join (select * from events e where e.timeStamp > cast(now()  as date)) e
        on hour(e.timeStamp) = h.hr
group by h.hr

【讨论】：

不幸的是还是一样的结果:(
嗨 Shrihari，我在 sqlfiddle 中运行测试并从事件 e 中选择 * 其中 e.timeStamp > now() - 间隔 24 小时给出 56 个事件。如果我在回复中运行查询，我会得到过去 24 小时内的 56 个事件。参见 sqlfiddle：sqlfiddle.com/#!9/0a8fbc/3。这不是预期的结果吗？如果不是，我们应该得到什么？
我正在计算过去 24 小时内每小时的记录数，我当前的查询给出了 0, 0, 0, 0, 10, 0, 28, 0, 2, 2, 0, 6, 4, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 这绝对是前两天添加的数据。我现在在一天的第 4 个小时。但是剩下的地方怎么填呢？
第一个查询填充了第四个之后的小时数，因为它是在 24 小时滑动窗口上计算的。所以你在第四个之后看到的时间是前一天的。但是，如果您只想要当天的事件，请在我的答案末尾添加
使用CURDATE() 表示今天早上的午夜。