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合 并 规 则 :<br />
P40 组 合 / 结 合<br />
A 1 A 2 …A n B i i=1,…m<br />
则 A 1 A 2 …A n B 1 B 2 …..B m<br />
例 : (title,year,length,genre)<br />
(title,year)<br />
(title,year)<br />
length<br />
genre<br />
则 (title,year) (length,genre)<br />
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