avg over partition by order by

avg() over(partition by ... order by ...)是一种分析函数，用于计算分组后的平均值。它的具体用法是在partition by子句中指定分组的列，在order by子句中指定排序的列。这样，avg()函数将根据指定的分组和排序条件计算每个分组的平均值。
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