Re: Why overlaps is not working

am Thu, dem 09.11.2006, um 15:46:50 +0200 mailte Andrus folgendes:
> set datestyle to iso,iso;
>
> select 1 where ('2006-10-31'::date, '9999-12-31'::date) OVERLAPS
> ('2006-10-16'::DATE, '2006-10-31':: DATE)
>
>
> does not return any rows.
>
> Why ?
> How to make overlaps to return correct result?

Because they don't overlaps.

Example:

test=*# select ('2006-10-01'::date, '2006-10-11'::date) OVERLAPS ('2006-10-11'::DATE, '2006-10-20'::DATE);
overlaps
----------
f
(1 row)

test=*# select ('2006-10-01'::date, '2006-10-12'::date) OVERLAPS ('2006-10-11'::DATE, '2006-10-20'::DATE);
overlaps
----------
t
(1 row)

Your date-range don't overlap, because the 2nd ends '2006-10-31' and the other
begin with '2006-10-31'. And your query can't return anything because the where-condition
returns false.

Andreas
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Andreas Kretschmer
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