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

sql 2005 rownumÓ÷¨ÒÔ¼°´øorder by ×Ó²éѯµÄÓ÷¨

--   sql   2005
  1.rownumÓ÷¨
  select   *   from(  
          Select   rownum=row_number()   over(order   by   1),*   from   table
  )a   where   rownum   between   1     and   10
  2.´øorder by ×Ó²éѯµÄÓ÷¨
sleect * from(select TOP 100 percent * from table order id )  a


Ïà¹ØÎĵµ£º

[SQL Server 2008]SQL Server 2008 °²×°Ê¾ÀýÊý¾Ý¿â

ÏÂÔØµØÖ·£ºhttp://msftdbprodsamples.codeplex.com/Release/ProjectReleases.aspx?ReleaseId=19353
ÎÒÏÂÔØµÄÊÇSQL2008.AdventureWorks_All_Databases.x86.msi£¬±¾²»ÏëÏÂÔØÕâÖÖ°²×°Îļþ£¬µ«½Å±¾Îļþ×ÜÊÇÖ´Ðгö´í£¬Ô­Òòû¾ßÌåÉ¡£ÕâÖÖ°²×°Îļþ°²×°ºó»á´´½¨Áù¸ö¿âAdventureWorks¡¢AdventureWorks2008¡¢AdventureWorksDW¡¢Ad ......

SQL Server DATEDIFF() º¯Êý

¶¨ÒåºÍÓ÷¨
DATEDIFF() º¯Êý·µ»ØÁ½¸öÈÕÆÚÖ®¼äµÄÌìÊý¡£
Óï·¨
DATEDIFF(datepart,startdate,enddate)
startdate ºÍ enddate ²ÎÊýÊǺϷ¨µÄÈÕÆÚ±í´ïʽ¡£
datepart ²ÎÊý¿ÉÒÔÊÇÏÂÁеÄÖµ£º
datepart
Ëõд
Äê
yy, yyyy
¼¾¶È
qq, q
ÔÂ
mm, m
ÄêÖеÄÈÕ
dy, y
ÈÕ
dd, d
ÖÜ
wk, ww
ÐÇÆÚ
dw, w
Сʱ
h ......

SQL ServerÊý¾Ý¿â³£ÓõÄT SQLÃüÁî

1. ²é¿´Êý¾Ý¿âµÄ°æ±¾
select @@version
2.²é¿´Êý¾Ý¿âËùÔÚ»úÆ÷²Ù×÷ϵͳ²ÎÊý
exec master..xp_msver
3. ²é¿´Êý¾Ý¿âÆô¶¯µÄ²ÎÊý
sp_configure
4.²é¿´Êý¾Ý¿âÆô¶¯Ê±¼ä
select convert(varchar(30),login_time,120) from master..sysprocesses where spid=1
²é¿´Êý¾Ý¿â·þÎñÆ÷ÃûºÍʵÀýÃû
print ''Server Name.... ......

SQL ServerË÷ÒýÔ­Ôò

ÈçºÎÈÃÄãµÄSQLÔËÐеøü¿ì
---- ÈËÃÇÔÚʹÓÃSQLʱÍùÍù»áÏÝÈëÒ»¸öÎóÇø£¬¼´Ì«¹Ø×¢ÓÚËùµÃµÄ½á¹ûÊÇ·ñÕýÈ·£¬¶øºöÂÔÁ˲»Í¬µÄʵÏÖ·½·¨Ö®¼ä¿ÉÄÜ´æÔÚµÄÐÔÄܲîÒ죬ÕâÖÖÐÔÄܲîÒìÔÚ´óÐ͵ĻòÊǸ´ÔÓµÄÊý¾Ý¿â»·¾³ÖУ¨ÈçÁª»úÊÂÎñ´¦ÀíOLTP»ò¾ö²ßÖ§³ÖϵͳDSS£©ÖбíÏÖµÃÓÈΪÃ÷ÏÔ¡£±ÊÕßÔÚ¹¤×÷ʵ¼ùÖз¢ÏÖ£¬²»Á¼µÄSQLÍùÍùÀ´×ÔÓÚ²»Ç¡µ±µÄË÷ÒýÉè¼Æ¡¢ ......

¸ßЧSQL²éѯ֮Ë÷Òý£¨II£©

ÉÏ»ØÎÒÃÇ˵µ½ÆÀ¹ÀÒ»ÌõÓï¾äÖ´ÐÐЧÂÊÖ÷Òª¿´Âß¼­ IO £¨É¶ÊÇÂß¼­ IO £¬É¶ÊÇÎïÀí IO ¼ûÁª»úÎĵµ£©£¬Õâ´ÎÎÒÃǼÌÐø¡£
ÎÒÃÇÏÈ˵˵£¬·µ»Ø¶àÐнá¹ûʱ£¬ÎªÊ²Ã´ SQLServer ÓÐʱ»áÑ¡Ôñ index seek £¬ÓÐʱ»áÑ¡Ôñ index scan ¡£
ÒÔ nonclustered index ΪÀý˵Ã÷¡£
ÏñËùÓеÄË÷Òý B Ê÷Ò»Ñù£¬·Ç¾Û¼¯Ë÷ÒýÊ÷Ò²°üÀ¨ÍêÈ«ÓÉË÷ÒýÊý¾Ý×é³ÉµÄ¸ù½ ......
© 2009 ej38.com All Rights Reserved. ¹ØÓÚE½¡ÍøÁªÏµÎÒÃÇ | Õ¾µãµØÍ¼ | ¸ÓICP±¸09004571ºÅ