Grouping into interval of 5 minutes within a time range

Question

I have some difficulties with mySQL commands that I want to do.

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

This is my current output statement.

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

How do I group them into 5 minutes interval results?

I want my output to be like

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 

Answer 1

This works with every interval.

PostgreSQL

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

MySQL

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