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函 数 依 赖 的 例 :<br />
例 Movies(title,year ,length, genre, studioName,starName)<br />
(title,year) length 决 定 <br />
(title,year) genre 函 数 依 赖 <br />
(title,year) studioName<br />
即 (title,year) ( length, genre, studioName)<br />
关 系 实 例 P38 图 3-2 1-3 行<br />
5-6 行<br />
18