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

&n= bsp; --^^^-- 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)

&n= bsp; --^^^-- 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

&n= bsp; --^^^-- 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 =3D 60

Purchase Unit =3D 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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