mysql 对时间操作

//mysql 对时间操作
select 
  create_date
from 
  kf_alarm_task 
where 
  create_date
  BETWEEN
  date_add(now(), interval -1 day)//前一天的时间
AND
  now()
//或
select date_add(now(), interval -1 day);

//查询你某天一天之前
SELECT * FROM employee WHERE hire_date < '2000-1-1 11:11:11'

//距今大于24小时
WHERE 
HOUR(timediff(now(),a.create_date))> 24