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10/26/2009 at 03:44PM PDT, ID: 24845562
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9.0

Postgres SQL: Best to find date range conflict

Asked by Thirt in PostgreSQL Database, SQL Query Syntax

I use the sql code below to find if an existing record exist for the same resource in the same date/time range.  So the resource 'Conference Room B' can not be double booked.

There is an existing record on 10/27/2009 from 8:00 - 9:00 am. The below sql is finding a match so as a work around, the user needs to specify 7:30 am - 7:45 to book the room before the existing reservation. So I think this is a more general SQL question. That is, what is the best way to test if an existing resource block of time conflicts with an existing record?

Idealy, I would like the user to specify the true time they need the room, from 7:30 am - 8:00 am.
1:
select dat_indexno, dat_resource from plus.tbl_waldo where dat_resource = 'Conference Room B' and ('10/27/2009 7:30:00 AM' <= dat_to) AND ('10/27/2009 8:00:00 AM' >= dat_from)"
[+][-]10/26/09 04:54 PM, ID: 25668177

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Zones: PostgreSQL Database, SQL Query Syntax
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Solution Provided By: DrCabbage
Participating Experts: 2
Solution Grade: A
 
 
[+][-]10/27/09 07:28 AM, ID: 25672770

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[+][-]10/27/09 07:32 AM, ID: 25672819

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[+][-]10/27/09 08:37 AM, ID: 25673612

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[+][-]10/27/09 08:44 AM, ID: 25673723

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[+][-]10/27/09 09:04 AM, ID: 25674036

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20091111-EE-VQP-91 - Hierarchy / EE_QW_3_20080625