Ò׽ؽØÍ¼Èí¼þ¡¢µ¥Îļþ¡¢Ãâ°²×°¡¢´¿ÂÌÉ«¡¢½ö160KB

mysql ÈÕÆÚº¯Êý

 ¶ÔÓÚÿ¸öÀàÐÍÓµÓеÄÖµ·¶Î§ÒÔ¼°²¢ÇÒÖ¸¶¨ÈÕÆÚºÎʱ¼äÖµµÄÓÐЧ¸ñʽµÄÃèÊö¼û7.3.6 ÈÕÆÚºÍʱ¼äÀàÐÍ¡£ 
ÕâÀïÊÇÒ»¸öʹÓÃÈÕÆÚº¯ÊýµÄÀý×Ó¡£ÏÂÃæµÄ²éѯѡÔñÁËËùÓмǼ£¬Æädate_colµÄÖµÊÇÔÚ×îºó30ÌìÒÔÄÚ£º 
mysql> SELECT something from table 
WHERE TO_DAYS(NOW()) - TO_DAYS(date_col) <= 30; 
DAYOFWEEK(date) 
·µ»ØÈÕÆÚdateµÄÐÇÆÚË÷Òý(1=ÐÇÆÚÌ죬2=ÐÇÆÚÒ», ……7=ÐÇÆÚÁù)¡£ÕâЩË÷ÒýÖµ¶ÔÓ¦ÓÚODBC±ê×¼¡£ 
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
ÄãÖ¸¶¨ÐÇÆÚÊÇ·ñ¿ªÊ¼ÓÚÐÇÆÚÌì»òÐÇÆÚÒ»¡£Èç¹ûµÚ¶þ¸ö²ÎÊýÊÇ0£¬ÐÇÆÚ´ÓÐÇÆÚÌ쿪ʼ£¬Èç¹ûµÚ¶þ¸ö²ÎÊýÊÇ1£¬
´ÓÐÇÆÚÒ»¿ªÊ¼¡£ 
mysql>


Ïà¹ØÎĵµ£º

ubuntu °²mysql install dbʱ³öÁËÎÊÌâ

ÕâÁ½ÌìÎÒ×°ÁËUBUNTU £¬ÔÚ±àÒë°²×°MYSQLµÄʱºòûÓгöʲôÎÊÌ⣬
µ½scripts/mysql_install_db --user=mysql
ÕâÒ»²½Ê±£¬µÃµ½ÈçÏ´íÎó
FATAL ERROR: Can't find mysqld. Please specify your installation
directory with the '--basedir=' option.
FATAL ERROR: Could not find SQL file '/fill_help_tables.sql'
µ½ÍøÉ ......

MySQL¶Ô±ê×¼SQLµÄÀ©Õ¹

MySQL·þÎñÆ÷°üº¬Ò»Ð©ÆäËûSQL DBMSÖв»¾ß±¸µÄÀ©Õ¹¡£×¢Ò⣬Èç¹ûʹÓÃÁËËüÃÇ£¬½«ÎÞ·¨°Ñ´úÂëÒÆÖ²µ½ÆäËûSQL·þÎñÆ÷¡£ÔÚijЩÇé¿öÏ£¬Äã¿ÉÒÔ±àд°üº¬MySQLÀ©Õ¹µÄ´úÂ룬µ«ÈÔ±£³ÖÆä¿ÉÒÆÖ²ÐÔ£¬·½·¨ÊÇÓÓ/*... */”×¢Ê͵ôÕâЩÀ©Õ¹¡£MySQL·þÎñÆ÷Äܹ»½âÎö²¢Ö´ÐÐ×¢ÊÍÖеĴúÂ룬¾ÍÏñ¶Ô´ýÆäËûMySQLÓï¾äÒ»Ñù£¬µ«ÆäËûSQL·þÎñÆ÷½«ºöÂÔ ......

CÓïÑÔÁ¬½ÓmysqlÊý¾Ý¿â£¬¶ÁÈ¡mysqlÄÚÈÝ

 //linuxϱàÒëg++ $(mysql_config --cflags)  ***.cpp  $(mysql_config --libs)
/*mysqlÊý¾Ý¿âÖбíµÄÄÚÈÝ
mysql> select * from maindb;
+------------------+---------+-------------+---------+----------+---------------------+---------------------+---------------------+------------------- ......

MySQLʹÓô¥·¢³ÌÐò

´¥·¢³ÌÐòÊÇÓë±íÓйصÄÃüÃûÊý¾Ý¿â¶ÔÏ󣬵±±íÉϳöÏÖÌØ¶¨Ê¼þʱ£¬½«¼¤»î¸Ã¶ÔÏó¡£ÔÚijЩ´¥·¢³ÌÐòµÄÓ÷¨ÖУ¬¿ÉÓÃÓÚ¼ì²é²åÈëµ½±íÖеÄÖµ£¬»ò¶Ô¸üÐÂÉæ¼°µÄÖµ½øÐмÆËã¡£
´¥·¢³ÌÐòÓë±íÏà¹Ø£¬µ±¶Ô±íÖ´ÐÐINSERT¡¢DELETE»òUPDATEÓï¾äʱ£¬½«¼¤»î´¥·¢³ÌÐò¡£¿ÉÒÔ½«´¥·¢³ÌÐòÉèÖÃΪÔÚÖ´ÐÐÓï¾ä֮ǰ»òÖ®ºó¼¤»î¡£ÀýÈ磬¿ÉÒÔÔÚ´Ó±íÖÐɾ³ýÿһÐÐÖ® ......

dz̸MysQLÖÐHANDLERÓï·¨½éÉܼ°Ê¹ÓÃ

½ñÌìС±àÒªºÍ´ó¼Ò˵µÄÊÇhandlerµÄÓ÷¨£¬Ï£Íû¶Ô´ó¼ÒÓÐËù°ïÖú¡£
HANDLER tbl_name OPEN [ AS alias ]
HANDLER tbl_name READ index_name { = | >= | <= | < } (value1,value2,...)
    [ WHERE where_condition ] [LIMIT ... ]
HANDLER tbl_name READ index_name { FIRST | NEXT | PREV | LAST } ......
© 2009 ej38.com All Rights Reserved. ¹ØÓÚE½¡ÍøÁªÏµÎÒÃÇ | Õ¾µãµØÍ¼ | ¸ÓICP±¸09004571ºÅ