row_number() over(partition by xxx order by xxx)的用法
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Oracle中row_number() over(partition by xxx order by xxx)的用法
row_number() over(partition by a order by b)
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上面的意思就是将查询结果按照a字段分组(partition),
然后组内按照b字段排序,至于asc还是desc,可自行选择,
然后为每行记录返回一个rownumber用于标记顺序
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