shopping cart

[John Smith]

Hi,

I'm trying to work out the postage rate for products in a shopping cart.
Predictably there is no formula for working out the postage rate (ie. 0.20 *
weight). The problem i'm having is with the statement for working this out

There are different 'bands' for the weight (i.e. between 150g and 200g the
price is 0.50). What's the best way to write a statement for this ? I have
tried different ways of writing an If statement but they all end up in
chaos.

John

 

[Aaron Bertrand - MVP]

Use a database table. Assuming SQL Server:



CREATE TABLE postageRates
(
weightlowerbound INT,
weightupperbound INT,
rate DECIMAL(19,2)
)

INSERT postageRates VALUES(0, 149, 0.25)
INSERT postageRates VALUES(150, 200, 0.50)
INSERT postageRates VALUES(201, 500, 0.85)
-- ...

DECLARE @weight INT
SET @weight = 172
SELECT rate FROM postageRates
WHERE @weight
BETWEEN weightlowerbound AND weightupperbound

DROP TABLE postageRates



You could also do this within an array in ASP...

 

[John Smith]

works great, thanks !

Use a database table. Assuming SQL Server:



CREATE TABLE postageRates
(
weightlowerbound INT,
weightupperbound INT,
rate DECIMAL(19,2)
)

INSERT postageRates VALUES(0, 149, 0.25)
INSERT postageRates VALUES(150, 200, 0.50)
INSERT postageRates VALUES(201, 500, 0.85)
-- ...

DECLARE @weight INT
SET @weight = 172
SELECT rate FROM postageRates
WHERE @weight
BETWEEN weightlowerbound AND weightupperbound

DROP TABLE postageRates



You could also do this within an array in ASP...



0.20