建立学生-课程模式S-T

·学生表：Student(Sno,Sname,Ssex,Sage,Sdept)
·课程表：Course(Cno,Cname,Cpno,Ccredit)
·学生选课表CS(Sno,Cno,Grade)
建立表命令：
CREATE TABLE Student  
        
      (Sno   CHAR(9) PRIMARY KEY,     
             
  Sname CHAR(20) UNIQUE,        
     
          Ssex    CHAR(2),
     
               Sage   SMALLINT,
  
               Sdept  CHAR(20)
); 
  
  
insert into student values('201215121','李勇','男',20,'CS');
insert into student values('201215122','刘晨','女',19,'CS');
insert into student values('201215123','王敏','女',18,'MA');
insert into student values('201215125','张立','男',19,'IS');
insert into student values('201215126','李一平','男',18,'IS');
insert into student values('201215127','张琴','女',19,'CS');
insert into student values('201215128','王方','女',20,'MA');
insert into student values('201215129','黄林林','男',21,'IS');

CREATE TABLE  Course 
         (Cno   CHAR(4) PRIMARY KEY, 
       	 Cname  CHAR(40),    
   
    	 Cpno     CHAR(4), 
     
    Ccredit  SMALLINT,
 
          ); 

insert into course values('1','数据库','5',4);
insert into course values('2','数学',null,2);
insert into course values('3','信息系统','1',4);
insert into course values('4','操作系统','6',3);
insert into course values('5','数据结构','7',4);
insert into course values('6','数据处理',null,2);
insert into course values('7','C语言','6',4);


CREATE TABLE  SC 
         (Sno  CHAR(9),
 
         Cno  CHAR(4),  
          Grade  SMALLINT, 
           PRIMARY KEY (Sno,Cno))

insert into sc values('201215121','1',92); 
insert into sc values('201215121','2',85); 
insert into sc values('201215121','3',88); 
insert into sc values('201215121','4',98); 
insert into sc values('201215121','5',89); 
insert into sc values('201215121','6',95); 
insert into sc values('201215121','7',93); 
insert into sc values('201215122','2',90); 
insert into sc values('201215122','3',80); 
insert into sc values('201215122','4',85); 
insert into sc values('201215122','6',92); 
insert into sc values('201215123','1',90); 
insert into sc values('201215123','2',84); 
insert into sc values('201215123','3',91); 
insert into sc values('201215123','4',90); 
insert into sc values('201215123','5',80); 
insert into sc values('201215123','6',78); 
insert into sc values('201215123','7',65); 
insert into sc values('201215128','1',78); 
insert into sc values('201215128','2',82); 
insert into sc values('201215128','3',77); 
insert into sc values('201215128','4',79); 
insert into sc values('201215128','5',92); 
insert into sc values('201215128','6',98); 
insert into sc values('201215128','7',50); 
insert into sc values('201215125','1',67); 
insert into sc values('201215125','2',71); 
insert into sc values('201215125','3',90); 
insert into sc values('201215126','4',81); 
insert into sc values('201215126','5',90); 
insert into sc values('201215126','6',56); 
insert into sc values('201215126','7',89); 
insert into sc values('201215127','1',81); 
insert into sc values('201215127','2',72); 
insert into sc values('201215127','3',90); 
insert into sc values('201215127','4',64); 
insert into sc values('201215127','5',79); 
insert into sc values('201215127','6',50); 
insert into sc values('201215127','7',96);
建立学生-课程模式S-T

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