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怎么找到第一个满足条件的行

根据reg_code,address去统计interval的累积值,当累积值到一个设定的常量值,比如86400,只要累计值刚刚等于或者大于这个常量值得时候返回对应的date_time。在DolphinDB表中的数据如下图所示。
image.png


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可以自定义一个如下所示的函数:

def firstTrigger(dt, value, threshold){
    return dt[find(value.cumsum() >= threshold, true)]
}
select firstTriggr(date_time, interval, 86400) from t group by reg_code,address

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