fixlinux.com » PostgreSQL http://fixlinux.com security + stability = sanity Wed, 07 Dec 2011 04:03:35 +0000 en hourly 1 http://wordpress.org/?v=3.2.1 randomize timestamp in postgresql http://fixlinux.com/2009/12/21/randomize-timestamp-in-postgresql/ http://fixlinux.com/2009/12/21/randomize-timestamp-in-postgresql/#comments Mon, 21 Dec 2009 19:52:44 +0000 derek http://fixlinux.com/2009/12/21/randomize-timestamp-in-postgresql/ The following may be useful for test data or if you need to get data into a table that has a timestamp column included in the primary key requirement.

Create a function that will allow you to specify a random number range (taken from the http://wiki.postgresql.org/wiki/Random_Range):

CREATE OR REPLACE FUNCTION random(numeric, numeric
RETURNS numeric AS $$
SELECT ($1 + ($2 - $1) * random())::numeric;
$$ LANGUAGE 'sql' VOLATILE;

I then used it to generate a range of timestamps for today:

select timestamp '2009-12-21' + random(0,86400) * interval '1 second' as timestamp;
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