※ 引述《hochengyuan (阿淵)》之銘言：
: （針對 SQL 語言的問題，用這個標題。請用 Ctrl+Y 砍掉這行）
: 資料庫名稱： SQL SERVER
: 資料庫版本： 2012
1. 列出所有和Steven Spielberg合作過的演員
//Steven Spielberg是導演 (directors)
select distinct a.first_name+' '+ a.last_name //好幾個重複的演員 so distinct
from directors as d
left join movie_dirtctors as md on d.id = md.director_id
left join movies as m on md.movie_id = m.id
left join roles as r on m.id = r.movie_id
left join actors as a on r.actor_id = a.id
where d.first_name = 'Steven'
and d.last_name = 'Spielberg'
;
2. 計算Steven Spielberg執導的電影的平均RANKS
//平均AVG
select AVG(m.rank)
from directors as d
left join movie_dirtctors as md on d.id = md.director_id
left join movies as m on md.movie_id = m.id
where d.first_name = 'Steven'
and d.last_name = 'Spielberg'
;
3. 列出Sean Connery出現的電影類別(GENRE)，並且統計次數後降冪排列
select mg.genre,count(mg.genre)
from actor as a
left join roles as r on a.id = r.actor_id
left join movies as m on r.movie_id = m.id
left join movies_genres as mg on m.id = mg.movie_id
where a.first_name = 'Sean'
and a.last_name = 'Connery'
group by mg.genre
order by count(mg.genre) desc
;
4. 計算每個演員平均的RANKING，並且降冪排列之
其實是我買新鍵盤 試一下打SQL手感如何 覺得不太好用 幫QQ
SQL很簡單啦 主key串在一起 就可以去別的資料表查資料了咩
思路就是相當於填一份「申請書」 想要什麼欄位就按照格式寫下來
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