RE: Design question: EFFECTIVE_?_DATE in a RATE table...

Chris,
The only issue I see with the modified table is that when you wish to obtain history from your child table based on two dates, to determine which rate to apply you need to base your SQL on two records. However if you store starting and ending dates it will be easy to identify the applicable rate.

HTH!
Aleem

> -----Original Message-----
> From: Grabowy, Chris [SMTP:cgrabowy_at_fcg.com]
> Sent: Monday, April 22, 2002 7:55 PM
> To: Multiple recipients of list ORACLE-L
> Subject: Design question: EFFECTIVE_?_DATE in a RATE table...
>
> A design question, my RATE table looks something like this....
>
> SQL> desc rate
> Name
> Null? Type
> ------------------------------------------------------------------------
> -------- -----------------
> RATE_CODE > NOT NULL CHAR(2)
> RATE_EFFECTIVE_START_DATE > NOT NULL DATE
> RATE_EFFECTIVE_END_DATE > NOT NULL DATE
> .
> .
>
> those are the PK fields...and the SQL to query the table is easy. I am
> trying to determine if I can "tighten up" the table, like this...
>
> SQL> desc rate
> Name
> Null? Type
> ------------------------------------------------------------------------
> -------- -----------------
> RATE_CODE > NOT NULL CHAR(2)
> RATE_EFFECTIVE_DATE > NOT NULL DATE
>
> I just haven't been able to code the right SQL.
>
> Has anyone else taken this approach?
>
> Sorry for these design questions, I am just being very anal about every
> table, PK column and index, before we dive into development and everything
> becomes "hard coded".
>
> TIA!!!!
>
> Chris
> --
> Please see the official ORACLE-L FAQ: http://www.orafaq.com
> --
> Author: Grabowy, Chris
> INET: cgrabowy_at_fcg.com
>
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Author: Koivu, Lisa
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Author: Abdul Aleem
  INET: dmit_at_beaconhouse.edu.pk

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