Обсуждение: 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 -- No virus found in this outgoing message. Checked by AVG Anti-Virus. Version: 7.0.300 / Virus Database: 265.6.13 - Release Date: 2005.01.16. -- No virus found in this outgoing message. Checked by AVG Anti-Virus. Version: 7.0.300 / Virus Database: 265.6.13 - Release Date: 2005.01.16.
=?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. ---------------------------(end of broadcast)--------------------------- TIP 7: don't forget to increase your free space map settings -- No virus found in this incoming message. Checked by AVG Anti-Virus. Version: 7.0.300 / Virus Database: 265.6.13 - Release Date: 2005.01.16. -- No virus found in this incoming message. Checked by AVG Anti-Virus. Version: 7.0.300 / Virus Database: 265.6.13 - Release Date: 2005.01.16. -- No virus found in this outgoing message. Checked by AVG Anti-Virus. Version: 7.0.300 / Virus Database: 265.6.13 - Release Date: 2005.01.16. -- No virus found in this outgoing message. Checked by AVG Anti-Virus. Version: 7.0.300 / Virus Database: 265.6.13 - Release Date: 2005.01.16.