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PLS-00302: component 'string' must be declared

PLS-00302: component 'string' must be declared
Cause: In a reference to a component (for example, in the name "A.B", "B" is a component of "A"), the component has not been declared. The component might be misspelled, its declaration might be faulty, or the declaration might be placed incorrectly in the block structure.
Action: Check the spelling and declaration of the component. Also confirm that the declaration is placed correctly in the block structure.

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小智
PLS-00302:必须声明组件' string ',
.原因:在对组件的引用中(例如,在名称“AB”中,“B”是“A”的组件),组件尚未声明。组件可能拼写错误,其声明可能有问题,或声明可能在块结构中不正确地放置。,
.操作:检查组件的拼写和声明。同时确认声明在块结构中正确放置。,
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