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MovieInfo(mvID,title,rating,year,length,studio)
Director(directorID,firstname,lastname)
Memeber(username,email,password)
Actor(actorID,firstname,lastname,gender,birthplace)
Cast(mvID,actorID)
Direct(mvID,directorID)
Genre(mvID,genre)
Ranking(username,mvID,score,voteDate)
1¡¢ÕÒ³öÓÐÏàͬÊýÁ¿µ¼ÑÝDirectorºÍÏàͬÊýÁ¿ÑÝÔ±µÄµçÓ°£¬Êä³öÕâЩµçÓ°µÄid£¨mvID£©¡£
2¡¢ÕÒ³ö12¸öÔÂÖÐÄĸöÔÂµÄÆ±Êý×î¸ß£¬Êä³öÔ·ݺÍ×ÜÆ±Êý¡££¨PS£ºÓ¦¸ÃÊÇÔÚRankingÖвéѯ£¬Òª
ÇóʹÓÃto_char£©
3¡¢Áгö½ö½ö¶ÔDrama£¨µ¼ÑÝ£©µÄµçӰͶÁËÆ±µÄMemebersµÄusername£¬ÒªÇóʹÓÃMINUS¡£
PS:²»ÊÇ×÷Òµ£¬ÊDZ¾ÈËÏëѧϰOracle£¬µ«²»Öª´ÓºÎÏÂÊÖ¡£Ï£Íû¸ßÊÖ½â¾ö¡£
SQL code:
1:
select ca.mvID
from Cast ca,Direct dr
where ca.mvID =dr.mvID
group by ca.mvID
having count(ca.actorID)=count(dr.directorID)
2:
select to_char(voteDate,'yyyy-mm') as yyyymm ,sum(score)
from Ranking
where rownum=1
group by to_char(voteDate,'yyyy-mm')
3:select username
from Ranking rk,Director dr
where rk.mvID=dr.mvID
and dr.lastname='Drama'
End_rbody_65100592//-->
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