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把对表SC的查询权限授予所有用户的SQL语句是()。A.GRANT SELECT ON TABLE SC TO PublicB.GP
把对表SC的查询权限授予所有用户的SQL语句是()。
A.GRANT SELECT ON TABLE SC TO Public
B.GPANT SELECT ON TABLE SC TO All
C.GRANT SELECT ON SC TO Public
D.GRANT SELECT ON SC TO All
把对表SC的查询权限授予所有用户的SQL语句是()。
A.GRANT SELECT ON TABLE SC TO Public
B.GPANT SELECT ON TABLE SC TO All
C.GRANT SELECT ON SC TO Public
D.GRANT SELECT ON SC TO All
B、Check Constraint
C、Check References
D、Constraint Check
A、GRANT SELECT TO SC ON Wang WITH PUBLIC
B、GRANT SELECT ON SC TO Wang WITH PUBLIC
C、GRANT SELECT TO SC ON Wang WITH GRANT OPTION
D、GRANT SELECT ON SC TO Wang WITH GRANT OPTION
A GRANT SELECT ON 帐户 TO Jean
B GRANT SELECT TO Jean ON 帐户
C GRANT SELECT TO帐户 ON Jean
D GRANT SELECT ON Jean TO 帐户
(55)A.属性冲突
B.命名冲突
C.结构冲突
D.实体冲突
(56)A.将课程实体中的任课教师作为派生属性
B.将课程实体中的任课教师属性去掉
C.将课程实体中的任课教师属性去掉,在课程与教师实体间建立任课联系
D.将教师实体删除
(22) A.x y c 8 - + *
B.x y - c + 8 *
C.x y c 8 * + -
D.x y c + 8 * -
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