A view is a DerivedTable with extra properties, such as query expression and check type.
视图是一个具有额外属性的DerivedTable，比如查询表达式和检查类型。
Suppose that you need to query the system properties, such as the OS platform.
假定您需要查询系统属性，例如OS平台。
Suppose that you need to query the system properties, such as the OS platform.
假定您需要查询系统属性，例如OS平台。
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