mysql按时间查询

查询一天： 

select * from table where to_days(column_time) = to_days(now()); 
select * from table where date(column_time) = curdate(); 

查询一周(最近7天)： 

select * from table where DATE_SUB(CURDATE(), INTERVAL 7 DAY) <= date(column_time); 

查询一个月： 

select * from table where DATE_SUB(CURDATE(), INTERVAL INTERVAL 1 MONTH) <= date(column_time);