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【单选题】
关于视图更新,下列说法正确的是 ( )。
A.
视图只要从基本表导出的，则此视图允许更新。
B.
视图为行列子集视图且包含主码，则此视图允许更新。
C.
视图定义中含有order by子句，则此视图不允许更新。
D.
建立在可更新视图基础上的视图，则此视图允许更新。
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