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SQL SERVERµÄSQLÓï¾ä£ºselect Guest.ÂÿͱàÂë,Guest.ÂÿÍÐÕÃû,Hotel.ÂùÝÃû³Æ,Hotel.ÂùݵØÖ· from Guest,Hotel where Hotel.ÂùݱàÂë=SubString(Guest.ÂÿͱàÂë,1,10)
OracleµÄSQLÓï¾ä£ºselect Guest.ÂÿͱàÂë,Guest.ÂÿÍÐÕÃû,Hotel.ÂùÝÃû³Æ,Hotel.ÂùݵØÖ· from Guest,Hotel where Hotel.ÂùݱàÂë=SubStr(Guest.ÂÿͱàÂë,1,10)
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   Declare @S1 varchar(100)
   Select @S1='http://www.xrss.cn'
   Select Left(@S1,4)
   ------------------------------------
   ÏÔʾ½á¹û: http
   B.½ØÈ¡´Ó×Ö·û´®Óұ߿ªÊ¼N¸ö×Ö·û(ÀýÈçÈ¡×Ö·ûwww.163.com)
   Declare @S1 varchar(100)
   Select @S1='http://www.xrss.cn'
   Select right(@S1,11)  
   ------------------------------------
   ÏÔʾ½á¹û: www.163.com £¿£¿£¿£¿
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   Declare @S1 varchar(100)
   Select @S1='http://www.xrss.cn'
   Select SUBSTRING(@S1,8,3)  
   ------------------------------------
   ÏÔʾ½á¹û: www.163.com  
   ÒÔÉÏÀý×Ó½ÔÊÇÒÑÖª½ØÈ¡Î»Öü°³¤¶È,ÏÂÃæ½éÉÜδ֪λÖõÄÀý×Ó
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