Solved

Help with a query

Posted on 2002-04-05
6
169 Views
Last Modified: 2006-11-17
I am building an e-commerce site for motor accesories.  The idea is that the users selects their product and then their car type and model.  I would like to show only products that apply to that model.

My database is structured like:

PRODUCTS TABLE
ProductID (Autonumber)
ProductName (Text)
ProductModels (Text)

CAR MAKES TABLE (eg Ford)
MakeID

CAR MODELS TABLE (eg Escort)
ModelID

So in English I would like to show:

SELECT ALL
FROM PRODUCTS TABLE
WHERE ModelID NOT IN ProductModels

Is this possible?

Thanks

Robert
0
Comment
Question by:Orroland
  • 3
  • 2
6 Comments
 
LVL 9

Expert Comment

by:ornicar
ID: 6920808
The SQL syntax for this query is:

SELECT * FROM PRODUCTS
WHERE PRODUCTID NOT IN
(SELECT MODELID FROM PRODUCTMODELS)

0
 
LVL 54

Expert Comment

by:nico5038
ID: 6920824
Hi ornicar,

I guess you ment:
SELECT * FROM PRODUCTS
WHERE PRODUCTID NOT IN
(SELECT PRODUCTMODELS FROM PRODUCT);

But I get the impression that Richard stores multiple models in one PRODUCTMODELS field...
This would imply that there's a change of database design necessary or a "like *modelid*" construction...

Whats the content of the PRODUCTMODELS field Richard?

Nic;o)
0
 

Author Comment

by:Orroland
ID: 6920831
It is a text field with the modelID like 1,2,3,4.  I use check boxes to select the models which apply to the product.
0
Simplifying Server Workload Migrations

This use case outlines the migration challenges that organizations face and how the Acronis AnyData Engine supports physical-to-physical (P2P), physical-to-virtual (P2V), virtual to physical (V2P), and cross-virtual (V2V) migration scenarios to address these challenges.

 

Author Comment

by:Orroland
ID: 6920883
This is giving a Data type mismatch in criteria expression error???

...WHERE modelsubcats.modelsubcatID NOT IN (SELECT productdetails.productdetailmodels FROM productdetails)
0
 
LVL 54

Accepted Solution

by:
nico5038 earned 50 total points
ID: 6920909
That's because you store the numbers of multiple models, thus the field becomes.... text ;-)

The "general" solution for this is to create a "relation table" like:
tblProductModel with the fields:
ProductID
ModelID
Both making the unique key of the table.

BTW I would also change the CarsModels table into:
CAR MODELS TABLE (eg Escort)
MakeID
ModelID

Thus the relation between Make and Model becomes clear.

Havin created the relation table you can use your checkboxes to insert for each checked model the relation row.

Now the query is simply linking tblProductModel to the Products to show the productname.

Clear ?

Nic;o)
0
 

Author Comment

by:Orroland
ID: 6920969
Thanks for the help, this is a great solution.

Robert
0

Featured Post

Free Tool: SSL Checker

Scans your site and returns information about your SSL implementation and certificate. Helpful for debugging and validating your SSL configuration.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

The first two articles in this short series — Using a Criteria Form to Filter Records (http://www.experts-exchange.com/A_6069.html) and Building a Custom Filter (http://www.experts-exchange.com/A_6070.html) — discuss in some detail how a form can be…
Regardless of which version on MS Access you are using, one of the harder data-entry forms to create is one where most data from previous entries needs to be appended to new records, especially when there are numerous fields and records involved.  W…
In Microsoft Access, learn how to “cascade” or have the displayed data of one combo control depend upon what’s entered in another. Base the dependent combo on a query for its row source: Add a reference to the first combo on the form as criteria i…
Using Microsoft Access, learn some simple rules for how to construct tables in a relational database. Split up all multi-value fields into single values: Split up fields that belong to other things into separate tables: Make sure that all record…

809 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question