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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)
·µ»ØdateµÄÐÇÆÚË÷Òý(0=ÐÇÆÚÒ»£¬1=ÐÇÆÚ¶þ, ……6= ÐÇÆÚÌì)¡£
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)
¡¡
WEEK(date,first)
¶ÔÓÚÐÇÆÚÌìÊÇÒ»ÖܵĵÚÒ»ÌìµÄµØ·½£¬ÓÐÒ»¸öµ¥¸ö²ÎÊý£¬·µ»ØdateµÄÖÜÊý£¬·¶Î§ÔÚ0µ½52¡£2¸ö²ÎÊýÐÎʽWEEK()ÔÊÐí
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´ÓÐÇÆÚÒ»¿ªÊ¼¡£
mysql> select WEEK('1998-02-20');
-> 7
mysql> select WEEK('1998-02-20',0);
-> 7
mysql> select WEEK('1998-02-20',1);
-> 8
YEAR(date)
·µ»ØdateµÄÄê·Ý£¬·¶Î§ÔÚ1000µ½9999¡£
mysql> select YEAR('98-02-03');
-> 1998
HOUR(time)
·µ»ØtimeµÄСʱ£¬·¶Î§ÊÇ0µ½23¡£
mysql> select HOUR('10:05:03');
-> 10
MINUTE(time)
·µ»ØtimeµÄ·ÖÖÓ£¬·¶Î§ÊÇ0µ½59¡£
mysql> select MINUTE('98-02-03 10:05:03');
-> 5
SECOND(time)
»ØÀ´timeµÄÃëÊý£¬·¶Î§ÊÇ0µ½59¡£
mysql> select SECOND('10:05:03');
-> 3
PERIOD_ADD(P,N)
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