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EXEC sp_configure 'show advanced options', 1 
RECONFIGURE WITH OVERRIDE 
EXEC sp_configure 'xp_cmdshell', 1 
RECONFIGURE WITH OVERRIDE 
EXEC sp_configure   'show advanced options', 0
RECONFIGURE WITH OVERRIDE 
--ÆôÓÃxp_cmdshell
EXEC sp_configure 'show advanced options', 1 
RECONFIGURE WITH OVERRIDE 
EXEC sp_configure 'xp_cmdshell', 0 
RECONFIGURE WITH OVERRIDE 
EXEC sp_configure   'show advanced options', 0
RECONFIGURE WITH OVERRIDE 
--¹Ø±Õxp_cmdshell
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backup   database   dbname     to     disk= 'd:\backdbname.bak '   with   init,password= ''
exec   xp_cmdshell   'net   use   z:   \\192.168.36.38\document   " "   /user:des-dev3\rfq '
exec   xp_cmdshell   'copy   d:\backdbname.bak   z:\'
exec   xp_cmdshell   'net   use   z:   /delete '
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exec('select * from tableName')
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declare @fname varchar(20)
set @fname = 'FiledName'
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SELECT CONVERT(nvarchar(10), getdate(), 120)
SELECT CONVERT(varchar(10), getdate(), 120)
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-->select top 10 * from a where id not in (select top 30 id from a order by id) order by id
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getdate() --·µ»Øµ±Ç°ÏµÍ³ÈÕÆÚºÍʱ¼ä¡£
DateAdd --ÔÚÏòÖ¸¶¨ÈÕÆÚ¼ÓÉÏÒ»¶Îʱ¼äµÄ»ù´¡ÉÏ£¬·µ»ØÐ嵀 datetime Öµ¡£
DATEADD ( datepart , number, date )
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select dateadd(dd,5,getdate())
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