Welcome to OStack Knowledge Sharing Community for programmer and developer-Open, Learning and Share
Welcome To Ask or Share your Answers For Others

Categories

0 votes
666 views
in Technique[技术] by (71.8m points)

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


与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
Welcome To Ask or Share your Answers For Others

1 Answer

0 votes
by (71.8m points)

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

与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
Welcome to OStack Knowledge Sharing Community for programmer and developer-Open, Learning and Share
Click Here to Ask a Question

...