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How to group time columns in 5 minute intervals and maximum / minimum value respectively SQL?

I have a database with a Datetime column containing intervals of +/- 30 seconds and a Value column containing random numbers from 10 to 100. My table looks like this:

datetime               value
----------------------------
2016-05-04 20:47:20    12
2016-05-04 20:47:40    44
2016-05-04 20:48:30    56
2016-05-04 20:48:40    25
2016-05-04 20:49:30    92
2016-05-04 20:49:40    61
2016-05-04 20:50:00    79
2016-05-04 20:51:20    76
2016-05-04 20:51:30    10
2016-05-04 20:51:40    47
2016-05-04 20:52:40    23
2016-05-04 20:54:00    40
2016-05-04 20:54:10    18
2016-05-04 20:54:50    12
2016-05-04 20:56:00    55

What I need for the following output:

datetime               max_val    min_val
-----------------------------------------
2016-05-04 20:45:00    92         12
2016-05-04 20:50:00    79         10
2016-05-04 20:55:00    55         55

Before I can even continue to get the maximum value and minimum value, I first need a GROUP of the datetime column with an interval of 5 minutes. According to my research, I came up with the following:

SELECT
  time,
  value
FROM random_number_minute
GROUP BY
  UNIX_TIMESTAMP(time) DIV 300

Actually, the GROUPS datetime column at 5 minute intervals:

datetime
-------------------
2016-05-04 20:47:20
2016-05-04 20:50:00
2016-05-04 20:56:00

, datetime , 20:45:00, 20:50:00 .. datetime 5 , , :

minutes    rounddown
--------------------
10         10
11         10
12         10
13         10
14         10
15         15
16         15
17         15
18         15
19         15
20         20

14:59, 10:00. :

SELECT
    time,
    time_rounded =
    dateadd(mi,(datepart(mi,dateadd(mi,1,time))/5)*5,dateadd(hh,datediff(hh,0,dateadd(mi,1,time)),0))

, , . :

native 'lateiff'

:

SELECT  
    time, CASE  
          WHEN  DATEDIFF(second, DATEADD(second, DATEDIFF(second, 0, time_out) / 300 * 300, 0), time) >= 240
            THEN    DATEADD(second, (DATEDIFF(second, 0, time) / 300 * 300) + 300, 0)
            ELSE    DATEADD(second, DATEDIFF(second, 0, time) / 300 * 300, 0)
          END

.

? datetime, ?

+4
3

, . , ..

SELECT FROM_UNIXTIME(FLOOR(UNIX_TIMESTAMP(datetime)/300)*300) x
     , MIN(value) min_value
     , MAX(value) max_value 
  FROM my_table 
 GROUP 
    BY x;
+1

GROUP BY.

:

SELECT from_unixtime(300 * round(unix_timestamp(r.datetime)/300)) AS 5datetime,
MAX(r.value) AS max_value, 
MIN(r.value) As min_value,
(SELECT r.value FROM random_number_minute ra WHERE ra.datetime = r.datetime order by ra.datetime desc LIMIT 1) as first_val
FROM random_number_minute r
GROUP BY UNIX_TIMESTAMP(r.datetime) DIV 300

:

5datetime               max_value   min_value   first_val
May, 04 2016 20:45:00   92          12          12
May, 04 2016 20:50:00   79          10          79
May, 04 2016 20:55:00   55          55          55

SQL Fiddle: http://sqlfiddle.com/#!9/e16b1/17/0

+1
SELECT 
    timestamp(concat(date(time), ' ', hour(time), ':', minute(time) div 5 * 5)) as floor_time,
    min(value),
    max(value)
FROM random_number_minute
GROUP BY date(time), hour(time), minute(time) div 5 * 5

http://sqlfiddle.com/#!9/91212f/5

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