How to update Table with other data is still calculating?

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SQL-Server-2008R2

Hi!

I can't quite explain my question but here is the explanation:

I have a table:

ID||Products||TotalPrice||Price1||DifPrice1||Price2||DifPrice2||Price3||DifPrice3||
01||Pencil  ||100.00    ||10.00 ||.00      ||25.00 ||.00      ||30.00 ||.00      ||

I want to update the DifPrice with this formula supposing that DifPrice has DifPrice10 and onwards:
TotalPrice - Price1 = DifPrice1
DifPrice1 - Price2 = DifPrice2
DifPrice2 - Price3 = DifPrice3
and etc.

DifPrice and TotalPrice is varchar. So there might be some convertion in the top part of the query.

Thanks for the help!

Posted 1-Jul-14 18:27pm

mitchiee1226

Updated 1-Jul-14 18:45pm

v2

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Peter Leow · Answer 1 · 2014-07-01T19:02:00

Oh no, you ought to start learning the correct way of database design[^].
These are some of my observations and suggestions:
First of all, why is data type of price in varchar?
Secondly, why do you need to store price difference as they are derivable from totalprice and the respective prices. Think about date of birth and age, which do you store in the database?
Lastly, you cannot keep adding new columns as many as the number of priceN, instead, change it into 2 tables:
table: product
product_id (primary key)
product_name
table: product_price
product_id
product_price (product_id and product_price are composite key)
both tables are linked through product_id in one to many relationship.