强制存取控制方法主要通过SQL语言的GRANT和REVOKE实现。()
强制存取控制方法主要通过SQL语言的GRANT和REVOKE实现。()
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20 ) 下列 SQL 语句中 , 能够实现 “ 收回用户 WANG 对学生表 ( STUDENT ) 中学号 ( XH ) 的修改权 ” 这一功能的是A ) GRANT UPDATE ( XH ) ON STUDENT TO WANGB ) GRANT UPDATE ( XH ) ON TABLE TO WANGC ) REVOKE UPDATE ( XH ) ON STUDENT FROM WANGD ) REVOKE UPDATE ( XH ) ON TABLE TO WANG
The user Sue issues this SQL statement:GRANT SELECT ON sue. EMP TO alice WITH GRANT OPTION; The user Alice issues this SQL statement:GRANT SELECT ON sue. EMP TO reena WITH GRANT OPTION; The user Reena issues this SQL statement:GRANT SELECT ON sue. EMP TO timber;The user Sue issues this SQL statement:REVOKE select on sue. EMP FROM alice;For which users does the revoke command revoke SELECT privileges on the SUE.EMP table?()A. Alice onlyB. Alice and ReenaC. Alice, Reena, and TimberD. Sue, Alice, Reena, and Timber
单选题The user Sue issues this SQL statement: GRANT SELECT ON sue. EMP TO alice WITH GRANT OPTION; The user Alice issues this SQL statement: GRANT SELECT ON sue. EMP TO reena WITH GRANT OPTION; The user Reena issues this SQL statement: GRANT SELECT ON sue. EMP TO timber; The user Sue issues this SQL statement: REVOKE select on sue. EMP FROM alice; For which users does the revoke command revoke SELECT privileges on the SUE.EMP table?()AAlice onlyBAlice and ReenaCAlice, Reena, and TimberDSue, Alice, Reena, and Timber