Any function for calculating inersect of intervals?
Hi,
wondering if exists any functions which aim to calculate intersect of two
intervals.
E.g. I have four dates (D1, D2, D3, D4) and I want to know if (D1,D2)
intersects (D3,D4) or not.
I konw that it can be done by comparing the dates (>=,<=), but I'm wonder if
I can do it simpler and shorter.
Thank you very much.
-- Csaba
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=?iso-8859-2?Q?Egy=FCd_Csaba?= <csegyud@vnet.hu> writes:
E.g. I have four dates (D1, D2, D3, D4) and I want to know if (D1,D2)
intersects (D3,D4) or not.
See the OVERLAPS operator:
( start1, end1 ) OVERLAPS ( start2, end2 )
http://developer.postgresql.org/docs/postgres/functions-datetime.html
regards, tom lane
Együd Csaba wrote:
Hi,
wondering if exists any functions which aim to calculate intersect of two
intervals.
E.g. I have four dates (D1, D2, D3, D4) and I want to know if (D1,D2)
intersects (D3,D4) or not.
Try INTERSECTS :P
SELECT * FROM table WHERE (D1, D2) INTERSECTS (D3, D4);
Related, are there any operators/functions to test for adjacency (start
of one is end of other), inclusion (interval is inside other interval)
or wrapping (the inverse; interval is around other interval) of intervals?
Alban.
Alban Hertroys wrote:
SELECT * FROM table WHERE (D1, D2) INTERSECTS (D3, D4);
Ahem... Let's call that "end of the day dementia" or something... Of
course it's called OVERLAPS, not INTERSECTS...
Thank you Tom.
-----Original Message-----
From: Tom Lane [mailto:tgl@sss.pgh.pa.us]
Sent: Monday, January 17, 2005 5:37 PM
To: Együd Csaba
Cc: pgsql-general@postgresql.org
Subject: Re: [GENERAL] Any function for calculating inersect of intervals?
=?iso-8859-2?Q?Egy=FCd_Csaba?= <csegyud@vnet.hu> writes:
E.g. I have four dates (D1, D2, D3, D4) and I want to know if (D1,D2)
intersects (D3,D4) or not.
See the OVERLAPS operator:
( start1, end1 ) OVERLAPS ( start2, end2 )
http://developer.postgresql.org/docs/postgres/functions-datetime.html
regards, tom lane
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Thak you Alban, Tom's solution (OVERLAPS) is the best for me.
bye,
-- Csaba
-----Original Message-----
From: pgsql-general-owner@postgresql.org
[mailto:pgsql-general-owner@postgresql.org] On Behalf Of Alban Hertroys
Sent: Monday, January 17, 2005 5:49 PM
To: Együd Csaba
Cc: pgsql-general@postgresql.org
Subject: Re: [GENERAL] Any function for calculating inersect of intervals?
Együd Csaba wrote:
Hi,
wondering if exists any functions which aim to calculate intersect of
two intervals.
E.g. I have four dates (D1, D2, D3, D4) and I want to know if (D1,D2)
intersects (D3,D4) or not.
Try INTERSECTS :P
SELECT * FROM table WHERE (D1, D2) INTERSECTS (D3, D4);
Related, are there any operators/functions to test for adjacency (start of
one is end of other), inclusion (interval is inside other interval) or
wrapping (the inverse; interval is around other interval) of intervals?
Alban.
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