mysql 解决 datetime 类型的比较问题

开发要求，获取当月佣金，主要卡在了sql对datetime 类型的判断

先后用过4种方法如下

1.select sum('price') from rrr_order_level where active_time < "2015-09-30 00:00:00";
2.select sum('price') from rrr_order_level where timestampdiff(hour,'2008-08-08 12:00:00','2008-08-08 00:00:00') > 0
3.select sum('price') from rrr_order_level where active_time < '$EndDate' and active_time > '$BeginDate'"
4.select sum('price') from rrr_order_level where active_time between '2015-09-01 00:00:00' and '2015-09-30 00:00:00';

 

数据库如上

分析错误，mysql不知道对应的年月日，无法比较，采用

select sum(price) from rrr_order_level where active_time >= STR_TO_DATE('2015-09-01 00:00:00','%Y-%m-%d %H:%i:%s') and active_time <= STR_TO_DATE('2015-09-30 00:00:00','%Y-%m-%d %H:%i:%s');

完美解决问题！