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mysql> SELECT something from table 
WHERE TO_DAYS(NOW()) - TO_DAYS(date_col) <= 30; 
DAYOFWEEK(date) 
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mysql> select DAYOFWEEK('1998-02-03'); 
-> 3 
WEEKDAY(date) 
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mysql> select WEEKDAY('1997-10-04 22:23:00'); 
-> 5 
mysql> select WEEKDAY('1997-11-05'); 
-> 2 
DAYOFMONTH(date) 
·µ»ØdateµÄÔ·ÝÖÐÈÕÆÚ£¬ÔÚ1µ½31·¶Î§ÄÚ¡£ 
mysql> select DAYOFMONTH('1998-02-03'); 
-> 3 
DAYOFYEAR(date) 
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mysql> select DAYOFYEAR('1998-02-03'); 
-> 34 
MONTH(date) 
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mysql> select MONTH('1998-02-03'); 
-> 2 
DAYNAME(date) 
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mysql> select DAYNAME("1998-02-05"); 
-> 'Thursday' 
MONTHNAME(date) 
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mysql> select MONTHNAME("1998-02-05"); 
-> 'February' 
QUARTER(date) 
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mysql> select QUARTER('98-04-01'); 
-> 2 
WEEK(date) 
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