用SQL语言定义关系 学生关系S,包括学号Sno,姓名Sn,专业Sdept 急求大神指

用SQL语言定义关系 学生关系S,包括学号Sno,姓名Sn,专业Sdept 急求大神指点！

create table S（Sno varchar（20），Sn varchar（50），Sdep varchar（10））

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罗湖鹏程医院是正规医院吗？

1.select * from student; 2.select sno,sname,sage from student where sdept='信息系'; 3.select sno from sc where grade<60; 5.select * from from student order by sage asc; 6.select s.sno,s.sname from student s,course c,sc where s.sno=sc.sno and c.cno=sc.cno and c.cname=课程名; 7.select sname,sage,sdept from student where sage between 20 and 23; 8.select s.sno,s.sname from student s,course c,sc where s.sno=sc.sno and c.cno=sc.cno and c.cname in ('计算机导论','高等数学'); 9.select * from student where sname like '张%'; 11.select count(sc.sno) from course c,sc where c.cno=sc.cno and cname=课程名; 12.select s.sno,s.sname,sc.grade from student s,sc where s.sno=sc.sno and sc.cno='c05' order by sc.grade desc; 13.select cno,cname,avg(grade),count(sno) from course c,sc where c.cno=sc.cno and grade is not null group by cno,cname; 15.select sno,sname,sdept from student s,sc where s.sno=sc.sno group by sno,sname,sdept having avg(grade)>75; 17.select sno from (select top 1 s.sno,avg(grade) from student s,sc where s.sno=sc.sno group by s.sno order by avg(grade)), 20 select top 3 sno,sname,sdept from student s,course c,sc where s.sno=sc.sno and c.cno=sc.cno and c.cname='高等数学' order by sc.grade;

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2013年开始在鹏城医院治疗疤痕至今未愈，虽然复诊是免费的，但是治不好。目前隔一段时间还是会去复诊。