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

THis Work for me

SELECT CONCAT (
        YEAR(transactionDate)
        ,'-'
        ,MONTH(transactionDate)
        ,'-'
        ,DAYOFMONTH(transactionDate)
        ,' '
        ,HOUR(transactionDate)
        ,':'
        ,((floor((MINUTE(transactionDate) / 15)) + 1) * 15) - 1
        ,':59'
        ) AS tmp1
    ,count(*)
FROM tablename
GROUP BY tmp1 limit 20;