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Calculate relative dates in Oracle


Calculate relative dates in Oracle

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Jason Coleman
Jason  Coleman
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Hi,
I'm doing some work in Oracle on date ranges, and have a calendar table with Activity_date. I'd like to calculate the "relative week no." from this, but I'm not sure of the functions to use...
In MS SQL it was just easy to use datediff, but there is not such function in Oracle, as the dates are stored as numbers....

Anyone point me in the right direction

Thx..
Jeff Moden
Jeff Moden
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Jason Coleman (6/16/2009)
as the dates are stored as numbers....

Anyone point me in the right direction

Thx..


The dates should be stored as the Date datatype. What is the data type of the column the dates are stored in?

--Jeff Moden

RBAR is pronounced ree-bar and is a Modenism for Row-By-Agonizing-Row.
First step towards the paradigm shift of writing Set Based code:
Stop thinking about what you want to do to a row... think, instead, of what you want to do to a column.
If you think its expensive to hire a professional to do the job, wait until you hire an amateur. -- Red Adair

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Jason Coleman
Jason  Coleman
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Right... finally started thinking straight...

select
activity_date,
to_char(activity_date,'IW')-to_char(sysdate,'IW') as Date_diff
from
dw.calendar



and then hey presto! w00t
Jeff Moden
Jeff Moden
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Group: General Forum Members
Points: 85989 Visits: 41094
Jason Coleman (6/17/2009)
Right... finally started thinking straight...

select
activity_date,
to_char(activity_date,'IW')-to_char(sysdate,'IW') as Date_diff
from
dw.calendar



and then hey presto! w00t


Outstanding. Thanks for the feedback on this, Jason.

--Jeff Moden

RBAR is pronounced ree-bar and is a Modenism for Row-By-Agonizing-Row.
First step towards the paradigm shift of writing Set Based code:
Stop thinking about what you want to do to a row... think, instead, of what you want to do to a column.
If you think its expensive to hire a professional to do the job, wait until you hire an amateur. -- Red Adair

Helpful Links:
How to post code problems
How to post performance problems
Forum FAQs
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