Justin Pryzby <pryzby@telsasoft.com> writes: > On Mon, Jun 06, 2022 at 03:28:43PM +0530, Mayank Kandari wrote: >> SELECT event_id FROM event WHERE (event_sec > time.seconds) OR >> ((event_sec=time.seconds) AND (event_usec>=time.useconds) ORDER BY >> event_sec, event_usec LIMIT 1
> I think it'd be better if the column was a float storing the fractional number > of seconds. Currently, it may be hard for the planner to estimate rowcounts if > the conditions are not independent. I don't know if it's related to this > problem, though.
Also, even if you can't change the data representation, there's a more idiomatic way to do that in SQL: use a row comparison.
SELECT ... WHERE row(event_sec, event_usec) >= row(time.seconds, time.useconds) ...
I doubt this is notably more execution-efficient, but if you're getting a bad rowcount estimate it should help with that. It's easier to read too.