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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)
·µ»ØdateÔÚÒ»ÄêÖеÄÈÕÊý, ÔÚ1µ½366·¶Î§ÄÚ¡£
mysql> select DAYOFYEAR('1998-02-03');
-> 34
MONTH(date)
·µ»ØdateµÄÔ·ݣ¬·¶Î§1µ½12¡£
mysql> select MONTH('1998-02-03');
-> 2
DAYNAME(date)
·µ»ØdateµÄÐÇÆÚÃû×Ö¡£
mysql> select DAYNAME("1998-02-05");
-> 'Thursday'
MONTHNAME(date)
·µ»ØdateµÄÔ·ÝÃû×Ö¡£
mysql> select MONTHNAME("1998-02-05");
-> 'February'
QUARTER(date)
·µ»ØdateÒ»ÄêÖеļ¾¶È£¬·¶Î§1µ½4¡£
mysql> select QUARTER('98-04-01');
-> 2
WEEK(date)
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WEEK(date,first)
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