Re: "two time periods with only an endpoint in common do not overlap" ???

On 10/15/21 19:42, Ron wrote:
>
> The numeric ranges 0-10 and 10-19 overlap, just as the time ranges
> 00:01:00-00:00:02:00 overlaps 00:02:00-00:03:00.
>
> *It's the programmer's responsibility* to say what s/he really means,
> not for "the system" to make that choice.
>

It is the programmers choice:

--The canonical form.
--No overlap
select int4range(1,3), int4range(3, 5);
int4range | int4range
-----------+-----------
[1,3) | [3,5)

select int4range(1,3) && int4range(3, 5);
?column?
----------
f

--Making it overlap
select int4range(1,3, '[]'), int4range(3, 5, '[]');
int4range | int4range
-----------+-----------
[1,4) | [3,6)

select int4range(1,3, '[]') && int4range(3, 5, '[]');
?column?
----------
t

There is no straight time range, you would have to use tsrange or
tstzrange. The principle still holds though you can make ranges overlap
or not depending on '[)' or '[]'.

--
Adrian Klaver
adrian(dot)klaver(at)aklaver(dot)com