This query may seem complex, due primarily to its length.

该查询似乎很复杂，这主要是因为它的长度。

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The first query employs the LENGTH function.

第一个查询使用length函数。

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The query calls out to a separate method to obtain the file length.

查询会呼叫外面另一个方法来取得档案长度。

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The query calls out to a separate method to obtain the file length.

查询会呼叫外面另一个方法来取得档案长度。

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