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 /* 
 ±êÌ⣺һ¸öÏîÄ¿Éæ¼°µ½µÄ50¸öSQLÓï¾ä(ÕûÀí°æ) 
 ×÷Õߣº°®Ð¾õÂÞ.ع»ª
 Ê±¼ä£º2010-05-10 
 ËµÃ÷£ºÒÔÏÂÎåÊ®¸öÓï¾ä¶¼°´ÕÕ²âÊÔÊý¾Ý½øÐйý²âÊÔ£¬×îºÃÿ´ÎÖ»µ¥¶ÀÔËÐÐÒ»¸öÓï¾ä¡£ 
 ÎÊÌâ¼°ÃèÊö£º 
 --1.ѧÉú±í 
 Student(S#,Sname,Sage,Ssex) --S# ѧÉú±àºÅ,Sname ѧÉúÐÕÃû,Sage ³öÉúÄêÔÂ,Ssex ѧÉúÐÔ±ð 
 --2.¿Î³Ì±í  
 Course(C#,Cname,T#) --C# --¿Î³Ì±àºÅ,Cname ¿Î³ÌÃû³Æ,T# ½Ìʦ±àºÅ 
 --3.½Ìʦ±í  
 Teacher(T#,Tname) --T# ½Ìʦ±àºÅ,Tname ½ÌʦÐÕÃû 
 --4.³É¼¨±í  
 SC(S#,C#,score) --S# ѧÉú±àºÅ,C# ¿Î³Ì±àºÅ,score ·ÖÊý 
 */ 
 --´´½¨²âÊÔÊý¾Ý 
 create table Student(S# varchar(10),Sname nvarchar(10),Sage datetime,Ssex nvarchar(10)) 
 insert into Student values('01' , N'ÕÔÀ×' , '1990-01-01' , N'ÄÐ') 
 insert into Student values('02' , N'Ç®µç' , '1990-12-21' , N'ÄÐ') 
 insert into Student values('03' , N'Ëï·ç' , '1990-05-20' , N'ÄÐ') 
 insert into Student values('04' , N'ÀîÔÆ' , '1990-08-06' , N'ÄÐ') 
 insert into Student values('05' , N'ÖÜ÷' , '1991-12-01' , N'Å®') 
 insert into Student values('06' , N'ÎâÀ¼' , '1992-03-01' , N'Å®') 
 insert into Student values('07' , N'Ö£Öñ' , '1989-07-01' , N'Å®') 
 insert into Student values('08' , N'Íõ¾Õ' , '1990-01-20' , N'Å®') 
 create table Course(C# varchar(10),Cname nvarchar(10),T# varchar(10)) 
 insert into Course values('01' , N'ÓïÎÄ' , '02') 
 insert into Course values('02' , N'Êýѧ' , '01') 
 insert into Course values('03' , N'Ó¢Óï' , '03') 
 create table Teacher(T# varchar(10),Tname nvarchar(10)) 
 insert into Teacher values('01' , N'ÕÅÈý') 
 insert into Teacher values('02' , N'ÀîËÄ') 
 insert into Teacher values('03' , N'ÍõÎå') 
 create table SC(S# varchar(10),C# varchar(10),score decimal(18,1))&nbs


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