I've stumbled across this fun SQL question on reddit, recently. The question was looking at a time series of data points where some events happened. For each event, we have the start time and the end time timestamp start end ----------------------------------- 2018-09-03 07:00:00 1 null 2018-09-03 08:00:00 null null 2018-09-03 09:00:00 null null 2018-09-03 10:00:00 … Continue reading Find the Next Non-NULL Row in a Series With SQL
Tag: Time Series
How to Find the Longest Consecutive Series of Events in SQL
A very interesting problem that can be solved very easily with SQL is to find consecutive series of events in a time series. But what is a consecutive series of events in a time series? Take Stack Overflow, for example. Stack Overflow has a cool reputation system that uses badges to reward certain behaviour. As … Continue reading How to Find the Longest Consecutive Series of Events in SQL