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【单选题】
下面关于自然连接和等值连接的叙述中,不正确的是()
A.
自然连接是一种特殊的等值连接
B.
自然连接要求在两个关系中有公共属性，而等值连接不必
C.
两种连接都可以只用笛卡尔积和选择运算导出
D.
自然连接要在结果中去掉重复的属性，而等值连接不必
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