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Update Task05：SQL高级处理.md

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@ -53,7 +53,7 @@ ORDER BY 能够指定按照哪一列、何种顺序进行排序。为了按照
一是 将SUM、MAX、MIN等聚合函数用在窗口函数中
二是 RANK、DENSE_RANK等排序用的专用串口函数
二是 RANK、DENSE_RANK等排序用的专用窗口函数
## 5.2.1 专用窗口函数