在一个时间范围内分为5分钟间隔

我要执行的mySQL命令有一些困难。

SELECT a.timestamp, name, count(b.name) 
FROM time a, id b 
WHERE a.user = b.user
  AND a.id = b.id
  AND b.name = 'John'
  AND a.timestamp BETWEEN '2010-11-16 10:30:00' AND '2010-11-16 11:00:00' 
GROUP BY a.timestamp

这是我当前的输出语句。

timestamp            name  count(b.name)
-------------------  ----  -------------
2010-11-16 10:32:22  John  2
2010-11-16 10:35:12  John  7
2010-11-16 10:36:34  John  1
2010-11-16 10:37:45  John  2
2010-11-16 10:48:26  John  8
2010-11-16 10:55:00  John  9
2010-11-16 10:58:08  John  2

如何将它们分为5分钟间隔结果？

我希望我的输出像

timestamp            name  count(b.name)
-------------------  ----  -------------
2010-11-16 10:30:00  John  2
2010-11-16 10:35:00  John  10
2010-11-16 10:40:00  John  0
2010-11-16 10:45:00  John  8
2010-11-16 10:50:00  John  0
2010-11-16 10:55:00  John  11 

这适用于每个间隔。

PostgreSQL的

SELECT
    TIMESTAMP WITH TIME ZONE 'epoch' +
    INTERVAL '1 second' * round(extract('epoch' from timestamp) / 300) * 300 as timestamp,
    name,
    count(b.name)
FROM time a, id 
WHERE …
GROUP BY 
round(extract('epoch' from timestamp) / 300), name

的MySQL

SELECT
    timestamp,  -- not sure about that
    name,
    count(b.name)
FROM time a, id 
WHERE …
GROUP BY 
UNIX_TIMESTAMP(timestamp) DIV 300, name

我遇到了同样的问题。

我发现按任何分钟间隔进行分组很容易，只需将纪元除以分钟（以秒为单位），然后四舍五入或使用地板取余数即可。因此，如果您希望在5分钟内获得间隔，则将使用300秒。

    SELECT COUNT(*) cnt, 
    to_timestamp(floor((extract('epoch' from timestamp_column) / 300 )) * 300) 
    AT TIME ZONE 'UTC' as interval_alias
    FROM TABLE_NAME GROUP BY interval_alias

interval_alias       cnt
-------------------  ----  
2010-11-16 10:30:00  2
2010-11-16 10:35:00  10
2010-11-16 10:45:00  8
2010-11-16 10:55:00  11 

这将按选定的分钟间隔正确返回数据组。但是，它不会返回不包含任何数据的时间间隔。为了获得那些空的间隔，我们可以使用函数generate_series。

    SELECT generate_series(MIN(date_trunc('hour',timestamp_column)),
    max(date_trunc('minute',timestamp_column)),'5m') as interval_alias FROM 
    TABLE_NAME

结果：

interval_alias       
-------------------    
2010-11-16 10:30:00  
2010-11-16 10:35:00
2010-11-16 10:40:00   
2010-11-16 10:45:00
2010-11-16 10:50:00   
2010-11-16 10:55:00   

现在，要获得间隔为零的结果，我们只需将两个结果集进行外部联接。

    SELECT series.minute as interval,  coalesce(cnt.amnt,0) as count from 
       (
       SELECT count(*) amnt,
       to_timestamp(floor((extract('epoch' from timestamp_column) / 300 )) * 300)
       AT TIME ZONE 'UTC' as interval_alias
       from TABLE_NAME  group by interval_alias
       ) cnt
    
    RIGHT JOIN 
       (    
       SELECT generate_series(min(date_trunc('hour',timestamp_column)),
       max(date_trunc('minute',timestamp_column)),'5m') as minute from TABLE_NAME 
       ) series
  on series.minute = cnt.interval_alias

最终结果将包括具有所有5分钟间隔的系列，即使没有值的间隔也是如此。

interval             count
-------------------  ----  
2010-11-16 10:30:00  2
2010-11-16 10:35:00  10
2010-11-16 10:40:00  0
2010-11-16 10:45:00  8
2010-11-16 10:50:00  0 
2010-11-16 10:55:00  11 

通过调整generate_series的最后一个参数，可以轻松更改间隔。在我们的例子中，我们使用“ 5m”，但是它可以是我们想要的任何间隔。

您应该宁愿使用GROUP BY UNIX_TIMESTAMP(time_stamp) DIV 300而不是round（../ 300），因为四舍五入使我发现某些记录被计入两个分组的结果集中。

对于postgres来说，我发现使用它更容易，更准确

date_trunc

功能，例如：

select name, sum(count), date_trunc('minute',timestamp) as timestamp
FROM table
WHERE xxx
GROUP BY name,date_trunc('minute',timestamp)
ORDER BY timestamp

您可以为date_trunc提供各种分辨率，例如“分钟”，“小时”，“天”等。

查询将类似于：

SELECT 
  DATE_FORMAT(
    MIN(timestamp),
    '%d/%m/%Y %H:%i:00'
  ) AS tmstamp,
  name,
  COUNT(id) AS cnt 
FROM
  table
GROUP BY ROUND(UNIX_TIMESTAMP(timestamp) / 300), name

您可能需要将时间戳分解为ymd：HM并使用DIV 5将分钟分为5分钟的时间段-类似于

select year(a.timestamp), 
       month(a.timestamp), 
       hour(a.timestamp), 
       minute(a.timestamp) DIV 5,
       name, 
       count(b.name)
FROM time a, id b
WHERE a.user = b.user AND a.id = b.id AND b.name = 'John' 
      AND a.timestamp BETWEEN '2010-11-16 10:30:00' AND '2010-11-16 11:00:00'
GROUP BY year(a.timestamp), 
       month(a.timestamp), 
       hour(a.timestamp), 
       minute(a.timestamp) DIV 12

...然后以客户端代码的形式显示输出，使其以您喜欢的方式显示。或者，如果愿意，可以使用sql concat运算符来构建整个日期字符串，而不用获取单独的列。

select concat(year(a.timestamp), "-", month(a.timestamp), "-" ,day(a.timestamp), 
       " " , lpad(hour(a.timestamp),2,'0'), ":", 
       lpad((minute(a.timestamp) DIV 5) * 5, 2, '0'))

...然后再分组

不知道您是否仍然需要它。

SELECT FROM_UNIXTIME(FLOOR((UNIX_TIMESTAMP(timestamp))/300)*300) AS t,timestamp,count(1) as c from users GROUP BY t ORDER BY t;

2016-10-29 19:35:00 | 2016-10-29 19:35:50 | 4 |

2016-10-29 19:40:00 | 2016-10-29 19:40:37 | 5 |

2016-10-29 19:45:00 | 2016-10-29 19:45:09 | 6 |

2016-10-29 19:50:00 | 2016-10-29 19:51:14 | 4 |

2016-10-29 19:55:00 | 2016-10-29 19:56:17 | 1 |

这个怎么样：

select 
    from_unixtime(unix_timestamp(timestamp) - unix_timestamp(timestamp) mod 300) as ts,  
    sum(value)
from group_interval 
group by ts 
order by ts
;

我发现使用MySQL可能正确的查询如下：

SELECT SUBSTRING( FROM_UNIXTIME( CEILING( timestamp /300 ) *300,  
                                 '%Y-%m-%d %H:%i:%S' ) , 1, 19 ) AS ts_CEILING,
SUM(value)
FROM group_interval
GROUP BY SUBSTRING( FROM_UNIXTIME( CEILING( timestamp /300 ) *300,  
                                   '%Y-%m-%d %H:%i:%S' ) , 1, 19 )
ORDER BY SUBSTRING( FROM_UNIXTIME( CEILING( timestamp /300 ) *300,  
                                   '%Y-%m-%d %H:%i:%S' ) , 1, 19 ) DESC

让我知道你的想法。

select 
CONCAT(CAST(CREATEDATE AS DATE),' ',datepart(hour,createdate),':',ROUNd(CAST((CAST((CAST(DATEPART(MINUTE,CREATEDATE) AS DECIMAL (18,4)))/5 AS INT)) AS DECIMAL (18,4))/12*60,2)) AS '5MINDATE'
,count(something)
from TABLE
group by CONCAT(CAST(CREATEDATE AS DATE),' ',datepart(hour,createdate),':',ROUNd(CAST((CAST((CAST(DATEPART(MINUTE,CREATEDATE) AS DECIMAL (18,4)))/5 AS INT)) AS DECIMAL (18,4))/12*60,2))