Group mysql query by 15 min intervals

Question

I\'ve got a monitoring system that is collecting data every n seconds (n is approximately 10 but varies). I\'d like to aggregate the collected data by 15 minute intervals.

Answer 1

Following query groups rows and creates timestamps at 15 min intervals.

Select concat( date(created_dt) , ' ', sec_to_time(time_to_sec(created_dt)- time_to_sec(created_dt)%(15*60) + (15*60)))as created_dt_new from table_name group by created_dt_new 

E.g Timestamps
2016-11-09 13:16:29
2016-11-09 13:16:49
2016-11-09 13:17:06
2016-11-09 13:17:26
2016-11-09 13:18:24
2016-11-09 13:19:59
2016-11-09 13:21:17

Are grouped into 2016-11-09 13:30:00

1. sec_to_time(time_to_sec(created_dt)- time_to_sec(created_dt)%(15*60) + (15*60)))
   Upper bounds time to nearest 15 min interval. e.g 12:10 -> 12:15

2. concat( date(created_dt) , ' ', sec_to_time(time_to_sec(created_dt)- time_to_sec(created_dt)%(15*60) + (15*60)))
   Generates a timestamp taking the date from the timestamp field.

Answer 2

This worked for me

mysql> **SELECT FROM_UNIXTIME(UNIX_TIMESTAMP(NOW())- UNIX_TIMESTAMP(NOW())%(15*60));**
+---------------------------------------------------------------------+
| FROM_UNIXTIME(UNIX_TIMESTAMP(NOW())- UNIX_TIMESTAMP(NOW())%(15*60)) |
+---------------------------------------------------------------------+
| 2012-02-09 11:15:00                                                 |
+---------------------------------------------------------------------+
1 row in set (0.00 sec)

Answer 3

Unix timestamps: floor them to nearest 15 minute using one of the following:

timestamp div (15 * 60) * (15 * 60) -- div is integer division operator
timestamp - timestamp % (15 * 60)

Date time: assuming the datatype does not have fractional seconds, floor them to nearest 15 minute using:

date - INTERVAL EXTRACT(SECOND FROM date) SECOND - INTERVAL EXTRACT(MINUTE FROM date) % 15 MINUTE

DBFiddle

Answer 4

SELECT   FLOOR(UNIX_TIMESTAMP(timestamp)/(15 * 60)) AS timekey
FROM     table
GROUP BY timekey;

Answer 5

Try this , grouping of records of 15 minutes interval, you can change 15*60 to the interval in seconds you need

SELECT sec_to_time(time_to_sec(datefield)- time_to_sec(datefield)%(15*60)) as intervals from tablename
group by intervals

Answer 6

Adaptation of approach 1) below:

select Round(date_format(date, "%i") / (15*60)) AS interval  
from table
group by interval 

Adaptation of approach 3) below:

SELECT Round(Convert(substring(date_column, 14, 2), UNSIGNED) / (15*60)) AS interval /* e.g. 2009-01-04 12:20:00 */
FROM table 
GROUP BY interval;

A few approaches I've found here:

1)

select date_format(date, "%W") AS `Day of the week`, sum(cost)
from daily_cost
group by `Day of the week` 
order by date_format(date, "%w")

2)

select count(*) as 'count', 
  date_format(min(added_on), '%Y-%M-%d') as 'week commencing',
  date_format(added_on, '%Y%u') as 'week' 
from system 
where added_on >= '2007-05-16' 
group by week 
order by 3 desc;

3)

SELECT substring(postdate, 1,10) AS dd, COUNT(id) FROM MyTable GROUP BY dd;

(Also here: http://www.bradino.com/mysql/dayparting-on-datetime-field-using-substring/)

EDIT: All the solutions will perform badly on a table with a large number of records.