MySQL 5.7按特定的30分钟间隔分组

我有一个MySQL 5.7表,每行都有时间戳.我的目标是计算some_id列的值并根据指定的30分钟间隔对其进行分组.并仅显示计数大于0的间隔.
输入：

timestamp                 some_id
--------------            ------
2019-01-19 05:30:12       4
2019-01-19 05:40:12       8
2019-01-19 15:37:40       2
2019-01-20 01:57:38       2
2019-01-20 07:10:07       4
2019-01-20 22:10:38       2
2019-01-21 08:35:55       4

预期：

interval             COUNT(some_id)
-------------       -----------
05:30:00 - 06:00:00     2
07:00:00 - 07:30:00     1
08:30:00 - 09:00:00     1
22:00:00 - 22:30:00     1
etc..........

我曾尝试实施此处介绍的解决方案MySQL Group by specific 24 hour interval-但没有成功.

我的尝试

我不确定这是正确的解决方案

SELECT CONCAT(
          DATE_FORMAT(table.timestamp, "%H:"),
          IF("30">MINUTE(table.timestamp), 
          (CONCAT("00-",DATE_FORMAT(DATE_ADD(table.timestamp, INTERVAL 60 MINUTE), "%H:"),"30")), 
          (CONCAT("30-",DATE_FORMAT(DATE_ADD(table.timestamp, INTERVAL 30 MINUTE), "%H:"),"00")))) AS time_period,
            COUNT(*)
        FROM table
        GROUP BY time_period;

解决方法:

您提供的链接具有非常深奥的解决方案.尝试：

SELECT CONCAT(
  DATE_FORMAT(mydate, "%Y-%m-%d %H:"),
  IF("30">MINUTE(mydate), "00", "30")
) AS time_bin,
COUNT(*)
FROM mytable
GROUP BY CONCAT(
 DATE_FORMAT(mydate, "%Y-%m-%d %H:"),
 IF("30">MINUTE(mydate), "00", "30")
)

标签：mysql-5-7,mysql
来源： https://codeday.me/bug/20191108/2006544.html