【OCP认证12c题库】CUUG 071题库考试原题及答案（25）

  • choose the best answer

    • Evaluate the following SQL statement:

    ALTER TABLE hr.emp

    SET UNUSED (mgr_id);

    Which statement is true regarding the effect of the above SQL statement?

    A) Any views created on the EMP table that include the MGR_ID column would be automatically modified and remain valid.

    B) Any constraints defined on the MGR_ID column would be removed by the above command.

    C) Any synonym existing on the EMP table would have to be re-created.

    D) Any index created on the MGR in column would continue to exist until the DROP UNUSED COLUMNS command is executed.

    Answer：B

    (注意：列一旦被设置为 unused 以后，基于该列的约束、索引都被删除，同时相关的视图被无法访问。)

    原文地址：http://blog.51cto.com/13854012/2352744

    时间： 2024-10-03 06:29:26

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