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List:       postgresql-sql
Subject:    [SQL] How to get list of days between two dates?
From:       Christine Desmuke <cdesmuke () kshs ! org>
Date:       2006-06-06 21:06:47
Message-ID: 4485EE67.5060005 () kshs ! org
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Hello,

I'm trying to write a query and cannot figure out how to do it (or 
whether it can be done in SQL alone). Given a table containing events 
with their starting and ending days (may be single- or multi-day 
events), I need a list of the events occurring each day:

CREATE TABLE test_events (
   event_id serial,
   event_name text,
   start_time date,
   end_time date,
   CONSTRAINT event_pkey PRIMARY KEY (event_id)
);

INSERT INTO test_events (event_name, start_time, end_time) VALUES 
('First Event', '05/01/2006', '05/04/2006');
INSERT INTO test_events (event_name, start_time, end_time) VALUES 
('Second Event', '05/02/2006', '05/02/2006');
INSERT INTO test_events (event_name, start_time, end_time) VALUES 
('Third Event', '05/04/2006', '05/05/2006');
INSERT INTO test_events (event_name, start_time, end_time) VALUES 
('Fourth Event', '05/07/2006', '05/07/2006');

The query results should look like:

5/1/2006	First Event
5/2/2006	First Event
5/2/2006	Second Event
5/3/2006	First Event
5/4/2006	First Event
5/4/2006	Third Event
5/5/2006	Third Event
5/7/2006	Fourth Event

I've been experimenting with set-returning functions, but I haven't 
stumbled on the answer. Suggestions?

Thanks
--christine

Christine Desmuke
Database Administrator
Kansas State Historical Society
Topeka, KS
cdesmuke@kshs.org

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