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

Hi Chris,

I've seen this type of design before. Are you going to be storing historical rates? It kind of looks like it.

What I've seen that kills the queries is queries for current rates wanting 'and RATE_EFFECTIVE_END_DATE IS NULL'. This was on data that was a subset of an airline GDS. (Fairly good sized database with poor design)

If you are not storing historical rate codes, why would you even need the end_date? I would think if you are going to need history, you need the end_date and I don't think you can get around it.

Just a thought, fwiw

Lisa Koivu
Oracle Database Administrator
Fairfield Resorts, Inc.
5259 Coconut Creek Parkway
Ft. Lauderdale, FL, USA 33063
Office: 954-935-4117
Cell: 954-309-4157

> -----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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-- 
Please see the official ORACLE-L FAQ: http://www.orafaq.com
-- 
Author: Koivu, Lisa
  INET: lisa.koivu_at_efairfield.com

Fat City Network Services    -- (858) 538-5051  FAX: (858) 538-5051
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