SQLite & repeated fields

Jim Ault JimAultWins at yahoo.com
Thu Jan 8 01:17:23 EST 2009


Google " database schema examples BOM" and you will find many hits that will
cover the topic

An example link is to SqlMag.com:
Recursive Relationships
A BOM is a hierarchical structure that describes relationships among
components. For example, a car is made up of components such as a steering
wheel
Caution: This topic is probably too deep for your program, Sarah, as it
tackles recursive many-to-many relationships.
http://www.sqlmag.com/Article/ArticleID/42520/sql_server_42520.html
( yipee >> DOWNLOAD THE CODE:  Download the Code 42520.zip)


A better source to start may be:
http://www.databaseanswers.org/data_models/

Hope this helps

Jim Ault
Las Vegas

On 1/7/09 8:08 PM, "mfstuart" <mfstuart at cox.net> wrote:

> 
> Hi Sarah,
> How familiar are you with the concept of Bill of Materials, Production
> Orders, etc.?
> Where a sellable (or shippable item) is made up of components, and the
> components are assembled to gether with many other items - either purchased
> or sub-assemblies.
> This is the Bill of Materials - the structure of an item.
> 
> When a customer order is processed, the manufacturing dept produces the
> Production Orders, which looks at the B.O.M. and produces the Manufacturing
> B.O.M. - this is an expanded production order with all the customer orders
> multiplied against the B.O.M., which the assembly plant knows how many to
> make.
> 
> There are books on this on how to define the tables that hold the data, but
> I'm sure you could find this info online. It's reasonably elementary.
> 
> If you need more help, let me know. :)
> 
> Regards,
> Mark Stuart
> 
> 
> Sarah Reichelt-2 wrote:
>> 
>> Hi All,
>> 
>> I'm setting up an SQLite database and having some problems with table
>> design. The app is inventory control with a "Make" function i.e. it
>> stores the quantities of each raw material you have and when you
>> "make" a specified amount of a certain product, those amounts are
>> automatically deducted from the raw material stocks.
>> 
>> I have a very simple table for the raw materials, but the products
>> table is not so obvious (at least not to me), mainly because each
>> product will have a different number of items used in it's
>> manufacture.
>> 
>> Do I have to set up a large table allowing for the maximum possible
>> number of items?
>> e.g.
>> product name
>> product id
>> item 1
>> quantity 1
>> item 2
>> quantity 2
>> .
>> .
>> .
>> item 50
>> quantity 50
>> 
>> or is there any better way to hold a variable number of repeating fields?
>> 
>> TIA,
>> Sarah
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