nth_value窗口函数

NTH_VALUE是一种窗口函数，用于返回在窗口中第n行的measure_expr值。measure_expr可以是任何可以计算的表达式。NTH_VALUE函数的语法为NTH_VALUE(measure_expr, n) [FROM {FIRST|LAST}] [{RESPECT|IGNORE} NULLS OVER (analytic_clause)。它可以在指定的窗口内动态应用聚合函数，如sum、avg、max、min和count等。这个函数通常用于处理复杂的业务需求，可以根据需要返回窗口中的第n行值。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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