mysql 每天的統計 yyyy年MM月dd日 HH時mm分ss秒

select date_format(ok.CREATED_DT,'%Y-%m-%d'),count(*)

from ord_rkd ok

where ok.CREATED_DT BETWEEN '2014-07-02' and '2015-08-03'

group by date_format(ok.CREATED_DT,'%Y-%m-%d');