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use student_info;
create view results_view as
select r.student_id as ѧºÅ, s.student_name as ÐÕÃû, c.course_name as ¿Î³ÌÃû³Æ, r.result as ³É¼¨
from results r inner join students s on r.student_id=s.student_id
inner join courses c on r.course_id=c.course_id;
select * from results_view
where ¿Î³ÌÃû³Æ='¼ÆËã»úÓ¦Óûù´¡'and ³É¼¨ is not null
order by ³É¼¨ desc limit 3;

ÎÒ±£´æΪ8.9.sql,ÔËÐÐÁËһϣ¬³öÏÖ´íÎóÌáʾ£º
      mysql> c:\wamp\www\8.9.sql
      show warnings disabled.
      show warnings disabled.
      error:
      unknown command '\8'
      ->

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