drop user cascade,必须指定cascade以删除 system

回答: 是的，如果要使用DROP USER CASCADE命令删除system用户，必须指定CASCADE选项。CASCADE选项会删除与该用户相关的所有对象，包括表、视图、索引等。如果不指定CASCADE选项，系统会报错并拒绝删除system用户。
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