Re: Select Maths - Mailing list pgsql-sql
| From | Phillip Smith |
|---|---|
| Subject | Re: Select Maths |
| Date | |
| Msg-id | 000001c6a3f1$84cf1ed0$9b0014ac@ITPhil Whole thread Raw |
| In response to | Re: Select Maths ("Aaron Bono" <postgresql@aranya.com>) |
| Responses |
Re: Select Maths
("Aaron Bono" <postgresql@aranya.com>)
|
| List | pgsql-sql |
Beautiful – Works a treat. Thanks Aaron.
A follow-on problem now… I have the below column in the select, but I need to validate the value across all 3 rules – I need to assign it to a variable!!
Example – my pqty function calculates a value less than the suppliers minimum order qty (and therefore fails the first CASE below), I need to set the column to a new value (stock.purchase_unit) – That’s all OK. But I need to check this new value against the remaining 2 CASE’s…
<SNIP>
CASE WHEN pqty(stock.code) < stock.purchase_unit THEN stock.purchase_unit
--^^^-- Check that our suggested purchase qty is greater than then suppliers minimum order qty
WHEN MOD(pqty(stock.code), stock.box_qty) > 0 THEN stock.box_qty * ROUND(CAST(pqty(stock.code) AS DOUBLE PRECISION) / stock.box_qty)
--^^^-- Check that our suggested purchase qty is a multiple of the box qty
WHEN pqty(stock.code) < (urate(stock.code) * creditors.review_cycle) THEN urate(stock.code) * creditors.review_cycle
--^^^-- Check that our suggested purchase qty is greater than our Usage Rate x Creditor Review Cycle
END AS "pqty",
<SNIP>
Thanks again for all your help guys,
-p
-----Original Message-----
From: aaron.bono@gmail.com [mailto:aaron.bono@gmail.com] On Behalf Of Aaron Bono
Sent: Friday, 7 July 2006 18:37
To: Phillip Smith
Cc: pgsql-sql@postgresql.org
Subject: Re: [SQL] Select Maths
On 7/7/06, Phillip Smith <phillips@weatherbeeta.com.au> wrote:
Same SELECT query as before, different area of it… I have a function that calculates the recommended purchase order quantity for a stock item based off various other values and functions:
pqty(stock.code) AS "pqty"
This needs to be rounded up / down to the nearest multiple of the purchase unit quantity for that product – It's Friday afternoon and my head has refused to help me work out the maths all afternoon!
Example:
Pqty = 60
Purchase Unit = 25
Pqty needs to be rounded down to 50.
I guess I'm also asking if I should do this in the Pqty function or in the SELECT query to optimize the result?
select 25 * round(cast(60 as double precision) / 25)
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