mysql按30分钟进行分组
标签：date count _for cat mys nbsp form tail record
mysql按30分钟进行分组
time30, COUNT(*) AS num
FROM
(
select DATE_FORMAT(time,‘%Y-%m-%d %H:%i‘) as time30
from(
SELECT DATE_FORMAT(concat(date(CALL_DATE), ‘ ‘,HOUR (CALL_DATE),‘:‘,floor(MINUTE(CALL_DATE)/30)*30),‘%Y-%m-%d %H:%i‘ ) AS time FROM call_detail_records
) a
) as b
GROUP BY time30;