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修复如下报错
Oracle 提供了一个名为 DUAL 的虚拟表(伪表),专门用于在不需要从实际数据表中取数时凑齐语法结构。DUAL 表是什么:DUAL 是系统自带的一个只有一个字段、一行记录的特殊表。当你执行 SELECT 1 FROM DUAL 时,它只会返回一行结果 1。