As in the last example, we use the fn: distinct-values function to avoid duplicate purchases in the same category.

与前一个示例一样，使用fn： distinct - values函数避免重复出现同一类别中的购买。

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To account for that, we use the XQuery function fn: distinct-values .

为了处理这个问题，我们使用XQuery函数fn： distinct - values 。

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The problem is that the predicate with the fn: upper-case function prevents the use of XML indexes in DB2.

问题是如果使用包含fn： upper - case函数的谓词，就不会使用DB 2中的xml索引。

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The Fn (Function) button has been placed on the back of the camera for assigning frequently used functions.

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Users can easily call up or switch between functions assigned to the Fn (Function) button and control ring and change setting values as needed, allowing them to quickly set up their preferred style.

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The L-Fn (Lens Function) button suspends the autofocusing operation temporarily to avoid unintended focusing on obstacles that appear suddenly between the camera and the subject.

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