Re: Variable constants ? - Mailing list pgsql-general

From Rich Shepard
Subject Re: Variable constants ?
Date
Msg-id alpine.LNX.2.20.1908151422480.13052@salmo.appl-ecosys.com
Whole thread Raw
In response to Variable constants ?  (stan <stanb@panix.com>)
Responses Re: Variable constants ?  (Charles Clavadetscher <clavadetscher@swisspug.org>)
Re: Variable constants ?  (Luca Ferrari <fluca1978@gmail.com>)
Re: Variable constants ?  (Gavin Flower <GavinFlower@archidevsys.co.nz>)
List pgsql-general
On Thu, 15 Aug 2019, stan wrote:

> I need to put a few bossiness constants, such as a labor rate multiplier
> in an application. I am adverse to hard coding these things. The best plan
> i have come up with so far is to store them in a table, which would have
> only 1 row, and a column for each needed constant.
>
> Anyone have a better way to do this?
>
> Failing a better way is there some way I can limit this table to only
> allow one row to exist?

Stan,

I've resolved similar issues with changing regulatory agency staff. For your
application(s) I suggest a table like this:

create table labor_rate_mult (
   rate         real primary_key,
   start_date      date not null,
   end_date    date
)

This provides both a history of labor rate multipliers and the ability to
select either the most current one or a previous one.

If other factors affect the rate, add attribute columns for them.

Regards,

Rich



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