Group MySQL Data into Arbitrarily Sized Time Buckets

Posted by Eric J. on Stack Overflow See other posts from Stack Overflow or by Eric J.
Published on 2010-04-05T17:19:42Z Indexed on 2010/04/05 17:23 UTC
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How do I count the number of records in a MySQL table based on a timestamp column per unit of time where the unit of time is arbitrary?

Specifically, I want to count how many record's timestamps fell into 15 minute buckets during a given interval. I understand how to do this in buckets of 1 second, 1 minute, 1 hour, 1 day etc. using MySQL date functions, e.g.

SELECT YEAR(datefield) Y, MONTH(datefield) M, DAY(datefield) D, COUNT(*) Cnt FROM mytable GROUP BY YEAR(datefield), MONTH(datefield), DAY(datefield)

but how can I group by 15 minute buckets?

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