sql DATEPART£¨£©º¯Êý
cdateÊÇdatetimeÀàÐ͵Ä×Ö¶Î
ͳ¼ÆÒ»ÄêµÄÈçÏÂ
select datepart(yy,cdate) as 'Ô·Ý',sum(cmoney) from consumption group by datepart(yy,cdate)
ͳ¼ÆÒ»ÔµÄÈçÏÂ
select datepart(mm,cdate) as 'Ô·Ý',sum(cmoney) from consumption where datepart(yy,cdate)=2009 group by datepart(mm,cdate)
ͳ¼ÆÒ»ÖܵÄÈçÏÂ
select DATEPART(wk,cdate) as 'ÖÜ', sum(cmoney) from consumption group by DATEPART(wk,cdate)
ͳ¼ÆÒ»ÌìµÄÈçÏÂ
select DATEPART(dd,cdate) as 'ºÅ', sum(cmoney) from consumption where datepart(mm,cdate)=6 group by DATEPART(dd,cdate)
ÒÔÉÏÓõ½µÄ¾ÍÊÇ“DATEPART£¨£©”º¯Êý¡£º¯ÊýDATEPART£¨£©µÄ²ÎÊýÊÇÁ½¸ö±äÁ¿¡£µÚÒ»¸ö±äÁ¿Ö¸¶¨Òª³éÈ¡ÈÕÆÚµÄÄÄÒ»²¿·Ö£»µÚ¶þ¸ö±äÁ¿ÊÇʵ¼ÊµÄÊý¾Ý¡£
ÈÕÆڵĸ÷²¿·Ö¼°Æä¼òд
ÈÕÆÚ²¿·Ö ¼òд Öµ
year yy 1753--9999
quarter qq 1--4
month mm 1--12
day of year dy 1--366
day dd 1--31
week wk &n
Ïà¹ØÎĵµ£º
sql server2000ÖÐʹÓÃconvertÀ´È¡µÃdatetimeÊý¾ÝÀàÐÍÑùʽ£¨È«£©
ÈÕÆÚÊý¾Ý¸ñʽµÄ´¦Àí£¬Á½¸öʾÀý£º
CONVERT(varchar(16), ʱ¼äÒ», 20) ½á¹û£º2007-02-01 08:02/*ʱ¼äÒ»°ãΪgetdate()º¯Êý»òÊý¾Ý±íÀïµÄ×Ö¶Î*/
CONVERT(varchar(10), ʱ¼äÒ», 23) ½á¹û£º2007-02-01 /*varchar(10)±íʾÈÕÆÚÊä³öµÄ¸ñʽ£¬Èç¹û²»¹»³¤»á·¢Éú½ØÈ¡*/ ......
參¿¼: http://blog.sina.com.cn/s/blog_59b11d010100af1n.html
ÈçºÎ»Ö¸´/ÐÞ¸´MS SQLÊý¾Ý¿âµÄMDFÎļþ
Èç¹û±¸·ÝµÄÊý¾Ý¿âÓÐ2¸öÎļþ£¬·Ö±ðÊÇ.LDF ºÍ .MDF£¬´ò¿ªÆóÒµ¹ÜÀíÆ÷£¬ÔÚʵÀýÉÏÓÒ»÷---ËùÓÐÈÎÎñ--¸½¼ÓÊý¾Ý¿â£¬È»ºóÑ¡ÔñÄǸö.MDFÎļþ£¬¾Í¿ÉÒÔÁË¡£
¡¡¡¡»òÕßÔÚ²éѯ·ÖÎöÆ÷ÖÐÊäÈ룺
¡¡¡¡sp_attach_db "Êý¾Ý¿âÃû³Æ" ......
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 ......
ÏÖÔÚ´ó¶àÊýÃèÊöSQL Server 2005ÐÂÌØÐÔµÄÎÄÕ¶¼¹Ø×¢ÓÚ»ª¶ø²»ÊµµÄÌØÐÔ£¬ÈçSQLCLR»òXMLÊý¾ÝÀàÐÍ£¬¶ø¶ÔÐí¶àºÜºÃµÄÀϵÄT-SQLÓïÑԵĸĽøûÓеõ½Ó¦ÓеĹØ×¢¡£ÎÒÔø¾´ÓÐí¶àDBA¿ÚÖÐÌýµ½ÁîËûÃǸüÐ˷ܵÄÊÇ¿´µ½T-SQLÓïÑԵĸĽø,¶ø²»ÊÇÄÇЩгöÏֺͷ¢²¼µÄ¹¦ÄÜ¡£¶ÔÓÚSQLÓïÑÔµÄÒ»¸öºÜÓÐÓõÄʵ¼Ê¸Ä½øÊÇOUTPUT×Ӿ䣬ËüÔÊÐí²éѯһ¸öÊý¾ ......
SQL SERVER 2005ÒýÈëÁËÔÚµ¥Ò»Á¬½ÓÉ϶Զà»î¶¯½á¹û¼¯£¨Ò²³ÆΪMARS£©»ò¶à¸öÇëÇóµÄÖ§³Ö¡£Í¨¹ýÔÚÓëSQL SERVER 2005µÄÁ¬½ÓÉÏÆôÓÃÕâÒ»ÌØÐÔ£¬µ±´æÔÚÓëSqlconnectionÏà¹ØÁªµÄ¿ª·ÅʽSqlDataReaderʱ£¬Á¬½Ó½«²»»áÖжϡ£¼´Ê¹ÉÐδ¹Ø±Õµ±Ç°´ò¿ªµÄSqlDataReader£¬Ò²ÈÔÈ»Äܹ»ÔÚSqlconnectionÉÏÖ´ÐÐÆäËû²éѯ±ÈÈ磺SELECT£¬UPDATE£¬CREATETABL ......