text: -- 29.查詢任何一門課程
  -- 成績在 70 分以上的姓名、課程名稱和分數
  select s.sname, sc.cid, sc.score
  from sc 
  left join student as s 
  	on sc.sid = s.sid
  where sc.score > 70
  ;
  
  
  select s.sname, sc.cid, sc.score
  from sc 
  inner join student as s 
  	on sc.sid = s.sid
  		and sc.score > 70
  ;