详解Mysql中日期比较大小的方法

select * from product where add_time = '2013-01-12'

select * from product where Date(add_time) = '2013-01-12' 

select * from product where date(add_time) between '2013-01-01' and '2013-01-31'

select * from product where Year(add_time) = 2013 and Month(add_time) = 1 

mysql> SELECT something FROM table 
 WHERE TO_DAYS(NOW()) - TO_DAYS(date_col) <= 30;
DAYOFWEEK(date)

mysql> select DAYOFWEEK('1998-02-03'); 
 -> 3 
WEEKDAY(date)

mysql> select WEEKDAY('1997-10-04 22:23:00'); 
 -> 5 
 mysql> select WEEKDAY('1997-11-05'); 
 -> 2 
DAYOFMONTH(date)

mysql> select DAYOFMONTH('1998-02-03'); 
 -> 3 
DAYOFYEAR(date) 

mysql> select DAYOFYEAR('1998-02-03'); 
 -> 34 
MONTH(date) 

mysql> select MONTH('1998-02-03'); 
 -> 2 
DAYNAME(date)

mysql> select DAYNAME("1998-02-05"); 
 -> 'Thursday' 
MONTHNAME(date)

mysql> select MONTHNAME("1998-02-05"); 
 -> 'February' 
QUARTER(date)

mysql> select QUARTER('98-04-01'); 
 -> 2