【OCP認證12c題庫】CUUG 071題庫考試原題及答案（25）
阿新 • • 發佈：2019-02-21
reat 索引 create 無法訪問 oos follow alua int stat 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
(註意：列一旦被設置為 unused 以後，基於該列的約束、索引都被刪除，同時相關的視圖被無法訪問。)
【OCP認證12c題庫】CUUG 071題庫考試原題及答案（25）