Randall Skelton <skelton@brutus.uwaterloo.ca> writes:
>> Couldn't you code this as a WHERE test on the timestamp?
> That would be ideal as it is theoretically possible for there to be
> missing rows due to sampling errors; nevertheless, a WHERE test doesn't
> seem obvious to me. Can you please post an example?
Something like
WHERE (EXTRACT(EPOCH FROM timestamp)::numeric % 5) = 0;
The EXTRACT function returns double precision, but there's no double
modulo operator for some reason, hence the cast to numeric which does
have one.
regards, tom lane
