ORA-28024：must revoke grants of external roles to this role/user
错误码
错误描述：must revoke grants of external roles to this role/user
错误原因：The user or role altered to IDENTIFIED GLOBALLY has external roles directly granted - these must be revoked, since external roles cannot be granted to global users or roles.
解决方法：Use REVOKE to revoke the external roles from the user or role to be ALTERed.
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