question:
select * from table where created_at >
where is the problem? How to solve?

answer:
time writes dead,
closes, time opens, there must be closing time.

question is, why should it be a closed interval when querying this time field? It has to be a range?

I personally think it should look like this:
if this is a log table, the amount of data is tens of thousands of minutes. If there is no specified range, it is easy to select a time ten or 20 years ago to find out all of it, and then the result is too large and dies
. So, the use of time interval is to prevent the problem that the result set is too large

is this the truth? Or in mysql code, it would be better to have an interval