未知题型
WhichtwostatementsaretrueabouttherolesintheOracledatabase？（）
- A.Arolecanbegrantedtoitself.
B.RolesareownedbytheSYSuser.
C.Rolescanbegrantedtootherroles.
D.Arolecannotbeassignedexternalauthentication.
E.Arolecancontainbothsystemandobjectprivileges.
【参考答案】
C, E
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