RE: Help with date calculation

From: Shaw, Glen <Glen.Shaw_at_BellSouth.com>
Date: Thu, 16 Nov 2000 14:21:54 -0500
Message-Id: <10682.122291@fatcity.com>

Loren,

There are a 3 ways I can think of to approach this. 1. select *

      from timetable 
     where trunc((sysdate - to_date('01-Jan-1970','DD-Mon-YYYY')) * 86400) -

bdate > 1200;

2. select *

      from timetable 
     where (SysDate - (to_date('01-Jan-1970', 'DD-Mon-YYYY') +

(bdate/86400)))*1440 > 20

3. Add a date column to the table and a supporting index.

    Add an Insert/Update trigger to the process that calculates and populates

      the date field based on the numeric value.     Then:     

    select *

      from timetable 
     where datefield > (sysdate - (20/1440));

Number 3 is my preferred option because it allows an indexed search.

Hope this helps,
Glen

-----Original Message-----
From: LOREN SUMMERS [mailto:loren_summers_at_yahoo.com] Sent: Thursday, November 16, 2000 1:17 PM To: Multiple recipients of list ORACLE-L Subject: RE: Help with date calculation

Djordje,
I was pretty sure about the first one but I am not sure whether this is correct.
Can someone help mw with this date calculation. Really appreciate your help.

Thanks
Problem

All records where sydate - bdate > 20 minutes bdate is stored in seconds from 1970..
select * from timetable
 where

(sysdate-20/1440)-to_date('01-JAN-1970','DD-MON-YYYY')+bdate(24*60*60)>20);

• Djordje Jankovic <djankovic_at_corp.attcanada.ca> wrote:
  > As long as both adate and bdate are relative to the
  > same date the first
  > query:
  >
  > Select *
  > from timetable
  > where (adate-bdate) > 20 * 60;
  >
  > is OK.
  >
  > Djordje
  

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Received on Thu Nov 16 2000 - 13:21:54 CST