详解Mysql中日期比较大小的方法

假如有个表product有个字段add_time,它的数据类型为datetime,有人可能会这样写sql：

代码如下

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

代码如下

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

代码如下

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

其date_col的值是在最后30天以内：

代码如下

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

代码如下

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

代码如下

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

代码如下

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

代码如下

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

代码如下

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

代码如下

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

代码如下

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

代码如下

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

总结

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