row_number原理
时间: 2023-08-30 14:08:45 浏览: 42
row_number()函数的原理是使用over字句中的排序语句对记录进行排序,然后按照顺序生成序号。具体来说,row_number()函数会根据指定的排序规则对结果集进行排序,然后为每一行分配一个唯一的序号。序号的分配是按照排序结果的顺序进行的,即排在前面的行会分配较小的序号。这个函数常用于需要对结果集进行分页或者筛选前几行的场景,可以方便地获取指定范围内的数据。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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