MSSQL varbinaryת»»³É×Ö·û´®
--> Title : varbinaryת»»³É×Ö·û´®
--> Author : wufeng4552
--> Date : 2009-12-15
declare @s varchar(20),@bin varbinary(1000)
select @s='www.CSDN.net',@bin=cast(@s as varbinary(1000))
declare @re varchar(1000),@i int
select @re='',@i=datalength(@bin)
while @i>0
begin
select @re=substring('0123456789ABCDEF',substring(@bin,@i,1)/16+1,1)+
substring('0123456789ABCDEF',substring(@bin,@i,1)%16+1,1)+@re
,@i=@i-1
end
select '0x'+@re
select cast(@s as varbinary(1000))
/*
--------------------------
0x7777772E4353444E2E6E6574
(1 個資ÁÏÁÐÊܵ½Ó°響)
*/
/*
--------------------------
0x7777772E4353444E2E6E6574
(1 個資ÁÏÁÐÊܵ½Ó°響)
*/
Ïà¹ØÎĵµ£º
sql´æ´¢¹ý³Ì½Ì³Ì
[ËѼ¯ÕûÀí]sql´æ´¢¹ý³ÌÍêÈ«½Ì³Ì
Ŀ¼
1.sql´æ´¢¹ý³Ì¸ÅÊö
2.SQL´æ´¢¹ý³Ì´´½¨
3.sql´æ´¢¹ý³Ì¼°Ó¦ÓÃ
4.¸÷ÖÖ´æ´¢¹ý³ÌʹÓÃÖ¸ÄÏ
5.ASPÖд洢¹ý³Ìµ÷ÓõÄÁ½ÖÖ·½Ê½¼°±È½Ï
6.SQL´æ´¢¹ý³ÌÔÚ.NETÊý¾Ý¿âÖеÄÓ¦ÓÃ
7.ʹÓÃSQL´æ´¢¹ý³ÌÒªÌØ±ð×¢ÒâµÄÎÊÌâ
1.sql´æ´¢¹ý³Ì¸ÅÊö
ÔÚ´óÐÍÊý¾Ý¿âϵͳÖУ¬´æ´ ......
½ñÌìÔÚÁÄÌìϵͳÖÐÐèҪϵͳִÐÐÒ»¸ö¶à²ãǶÌײéѯ¡£
Ò»¿ªÊ¼Óï¾äÈçÏÂ×ܳöÏÖ´íÎó£ºÔÀ´ÊÇÔÚ]='123') ºóÎÒ¶à¼ÓÁËÒ»¸ö as tb1
¸ÄΪÈçϺó£¬ÕýÈ·ÔËÐС£
select * from ( select top(10) * from ( select top(100) * from (select [chatcontent].[senderid],[chatcontent].[id] ,[chatcontent].[toid] ,[chatc ......
1.¶Ô²éѯ½øÐÐÓÅ»¯£¬Ó¦¾¡Á¿±ÜÃâÈ«±íɨÃ裬Ê×ÏÈÓ¦¿¼ÂÇÔÚ where ¼° order by Éæ¼°µÄÁÐÉϽ¨Á¢Ë÷Òý¡£
2.Ó¦¾¡Á¿±ÜÃâÔÚ where ×Ó¾äÖжÔ×ֶνøÐÐ null ÖµÅжϣ¬·ñÔò½«µ¼ÖÂÒýÇæ·ÅÆúʹÓÃË÷Òý¶ø½øÐÐÈ«±íɨÃ裬È磺
select id from t where num is null
¿ÉÒÔÔÚnumÉÏÉèÖÃĬÈÏÖµ0£¬È·±£±íÖÐnumÁÐûÓÐnullÖµ£¬È»ºóÕâÑù²éѯ£º
select id ......
´Ómssql6.5¿ªÊ¼£¬Î¢ÈíÌṩÁËÁ½¸ö²»¹«¿ª£¬·Ç³£ÓÐÓõÄϵͳ´æ´¢¹ý³Ìsp_MSforeachtableºÍsp_MSforeachdb£¬ÓÃÓÚ±éÀúij¸öÊý¾Ý¿âµÄÿ¸ö±íºÍ±éÀúDBMS¹ÜÀíϵÄÿ¸öÊý¾Ý¿â¡£
ÎÒÃÇÔÚmasterÊý¾Ý¿âÀïÖ´ÐÐÏÂÃæµÄÓï¾ä¿ÉÒÔ¿´µ½Á½¸öprocÏêϸµÄ´úÂë
use master
exec sp_helptext sp_MSforeachtable
exec sp_helptext sp_Msforeachdb
sp_M ......
How is MSSQL using memory?
http://www.sqlhacks.com/Administration/Memory-Usage
Memory is one the most important factor affecting MSSQL performance.
As an administrator, you should be monitoring the memory
regularly. When Microsoft SQL Server runs out of memory, it will use
virtual memory: ie: ......