TIMESTAMP SUBTRACTION - Mailing list pgsql-general

From Madhavi Daroor
Subject TIMESTAMP SUBTRACTION
Date
Msg-id NHBBKMLNGKEMDMCGAMFNAEHECAAA.madhavi@zoniac.com
Whole thread Raw
Responses Re: TIMESTAMP SUBTRACTION  ("Shridhar Daithankar" <shridhar_daithankar@persistent.co.in>)
Re: TIMESTAMP SUBTRACTION  (Joseph Healy <j.healy@ugrad.unimelb.edu.au>)
Re: TIMESTAMP SUBTRACTION  (Tom Lane <tgl@sss.pgh.pa.us>)
Re: TIMESTAMP SUBTRACTION  (Alvaro Herrera <alvherre@dcc.uchile.cl>)
Re: TIMESTAMP SUBTRACTION (retry, list is bouncing emails)  (greg@turnstep.com)
List pgsql-general
Hi All,
     When I subtract 2 timestamp variables in postgres 2.3.1, I get an
interval value.
Eg:
SELECT TO_TIMESTAMP('05-21-2003 00:00:00','mm-dd-yyyy') -
TO_TIMESTAMP('04-30-2003 00:00:00','mm-dd-yyyy');
Result:
    21 days --------- This is an interval

But what I need is a numeric value. Ie; 21 and NOT 21 days.

I need to compare this difference with a numeric value in my WHERE clause
like this

WHERE
    TIMESTAMP('05-21-2003 00:00:00','mm-dd-yyyy') - TO_TIMESTAMP('04-30-2003
00:00:00','mm-dd-yyyy') > 30

But if I do this....I get wrong results. How do I do such a comparison? Or
How to I get a Numeric value after the subtraction?


Please reply SOON !!!

Thanx,
Madhavi Daroor




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