Oracle packages consist of two main components: package specification and package body.
Oracle包由两个主要部分组成：包规范说明和包主体。
The variables declared in the package specification are called global variables or public variables.
包规范说明中声明的变量称作全局变量，或公共变量。
Define and improve YFK package specification.
定义和改进包装设计规范。
Define and improve YFK package specification.
定义和改进包装设计规范。
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