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

sql serverÈÕÆÚʱ¼äº¯Êý

Sql ServerÖеÄÈÕÆÚÓëʱ¼äº¯Êý
1.  µ±Ç°ÏµÍ³ÈÕÆÚ¡¢Ê±¼ä
    select getdate() 
2. dateadd  ÔÚÏòÖ¸¶¨ÈÕÆÚ¼ÓÉÏÒ»¶Îʱ¼äµÄ»ù´¡ÉÏ£¬·µ»ØÐ嵀 datetime Öµ
   ÀýÈ磺ÏòÈÕÆÚ¼ÓÉÏ2Ìì
   select dateadd(day,2,'2004-10-15')  --·µ»Ø£º2004-10-17 00:00:00.000
3. datediff ·µ»Ø¿çÁ½¸öÖ¸¶¨ÈÕÆÚµÄÈÕÆÚºÍʱ¼ä±ß½çÊý¡£
   select datediff(day,'2004-09-01','2004-09-18')   --·µ»Ø£º17
4. datepart ·µ»Ø´ú±íÖ¸¶¨ÈÕÆÚµÄÖ¸¶¨ÈÕÆÚ²¿·ÖµÄÕûÊý¡£
  SELECT DATEPART(month, '2004-10-15')  --·µ»Ø 10
5. datename ·µ»Ø´ú±íÖ¸¶¨ÈÕÆÚµÄÖ¸¶¨ÈÕÆÚ²¿·ÖµÄ×Ö·û´®
   SELECT datename(weekday, '2004-10-15')  --·µ»Ø£ºÐÇÆÚÎå
6. day(), month(),year() --¿ÉÒÔÓëdatepart¶ÔÕÕÒ»ÏÂ
select µ±Ç°ÈÕÆÚ=convert(varchar(10),getdate(),120)
,µ±Ç°Ê±¼ä=convert(varchar(8),getdate(),114)
select datename(dw,'2004-10-15')
select ±¾ÄêµÚ¶àÉÙÖÜ=datename(week,'2004-10-15')
      ,½ñÌìÊÇÖܼ¸=datename(weekday,'2004-10-15')
 
º¯Êý                                          ²ÎÊý/¹¦ÄÜ
GetDate( )                                    ·µ»ØÏµÍ³Ä¿Ç°µÄÈÕÆÚÓëʱ¼ä
DateDiff (interval,date1,date2)               ÒÔinterval Ö¸¶¨µÄ·½Ê½£¬·µ»Ødate2 Óëdate1Á½¸öÈÕÆÚÖ®¼äµÄ²îÖµ date2-date1
DateAdd (interval,number,date)                ÒÔintervalÖ¸¶¨µÄ·½Ê½£¬¼ÓÉÏnumberÖ®ºóµÄÈÕÆÚ
DatePart (interval,date)                   &n


Ïà¹ØÎĵµ£º

SQLÓï¾ä´óÈ«(3)

--Óï ¾ä¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¹¦ ÄÜ
--Êý¾Ý²Ù×÷
SELECT¡¡¡¡¡¡--´ÓÊý¾Ý¿â±íÖмìË÷Êý¾ÝÐкÍÁÐ
INSERT¡¡¡¡¡¡--ÏòÊý¾Ý¿â±íÌí¼ÓÐÂÊý¾ÝÐÐ
DELETE¡¡¡¡¡¡--´ÓÊý¾Ý¿â±íÖÐɾ³ýÊý¾ÝÐÐ
UPDATE¡¡¡¡¡¡--¸üÐÂÊý¾Ý¿â±íÖеÄÊý¾Ý
--Êý¾Ý¶¨Òå
CREATE TABLE¡¡¡¡--´´½¨Ò»¸öÊý¾Ý¿â±í
DROP TABLE¡¡¡¡ --´ÓÊý¾Ý¿âÖÐɾ³ý±í
ALTER ......

sql²éѯÂýµÄÔ­Òò»ã×Ü


²éѯËÙ¶ÈÂýµÄÔ­ÒòºÜ¶à£¬³£¼ûÈçϼ¸ÖÖ£º
¡¡¡¡1¡¢Ã»ÓÐË÷Òý»òÕßûÓÐÓõ½Ë÷Òý(ÕâÊDzéѯÂý×î³£¼ûµÄÎÊÌ⣬ÊdzÌÐòÉè¼ÆµÄȱÏÝ)
¡¡¡¡2¡¢I/OÍÌÍÂÁ¿Ð¡£¬ÐγÉÁËÆ¿¾±Ð§Ó¦¡£
¡¡¡¡3¡¢Ã»Óд´½¨¼ÆËãÁе¼Ö²éѯ²»ÓÅ»¯¡£
¡¡¡¡4¡¢ÄÚ´æ²»×ã
¡¡¡¡5¡¢ÍøÂçËÙ¶ÈÂý
¡¡¡¡6¡¢²éѯ³öµÄÊý¾ÝÁ¿¹ý´ó(¿ÉÒÔ²ÉÓöà´Î²éѯ£¬ÆäËûµÄ·½·¨½µµÍÊý¾ÝÁ¿) ......

SQL SERVERÐÞ¸ÄÅÅÐò¹æÔò

1.sp_helpsort
SELECT SERVERPROPERTY ('Collation')
²é¿´ÄãµÄÅÅÐò¹æÔò.
²»¹ýÄãµÄÕâ¸öÓ¦¸ÃºÍ×Ö·û¼¯ÓйØ.
2.¸ü¸Ä·þÎñÆ÷ÅÅÐò¹æÔò
¸ü¸Ä SQL Server 2005 ʵÀýµÄĬÈÏÅÅÐò¹æÔòµÄ²Ù×÷¿ÉÄÜ»á±È½Ï¸´ÔÓ£¬°üÀ¨ÒÔϲ½Ö裺
È·±£¾ßÓÐÖØÐ´´½¨Óû§Êý¾Ý¿â¼°ÕâЩÊý¾Ý¿âÖеÄËùÓжÔÏóËùÐèµÄÈ«²¿ÐÅÏ¢»ò½Å±¾¡£
ʹÓù¤¾ß£¨ÀýÈç´óÈÝÁ ......

SQL ServerÖÐ charÓëvarchar  

¹Ì¶¨³¤¶È(char)Óë¿É±ä³¤¶È(varchar)×Ö·ûÊý¾ÝÀàÐÍ
char[(n)]
³¤¶ÈΪn¸ö×ֽڵĹ̶¨³¤¶ÈÇÒ·ÇUnicodeµÄ×Ö·ûÊý¾Ý¡£n±ØÐëÊÇÒ»¸ö½éÓÚ1ºÍ8,000Ö®¼äµÄÊýÖµ¡£´æ´¢´óСΪn¸ö×Ö½Ú¡£charÔÚSQL-92ÖеÄͬÒå´ÊΪcharacter¡£
varchar[(n)]
³¤¶ÈΪn¸ö×ֽڵĿɱ䳤¶ÈÇÒ·ÇUnicodeµÄ×Ö·ûÊý¾Ý¡£n±ØÐëÊÇÒ»¸ö½éÓÚ1ºÍ8,000Ö®¼äµÄÊýÖµ¡£´æ´¢´óСΪ ......
© 2009 ej38.com All Rights Reserved. ¹ØÓÚE½¡ÍøÁªÏµÎÒÃÇ | Õ¾µãµØÍ¼ | ¸ÓICP±¸09004571ºÅ