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Think I need another table

Hi there,
I have done a few databases in MS Access 2007 and I normally do OK when coming up with a structure and relationships. etc.

A friend of mine has also done one for his new venture, but is having trouble and asked me if I could help him out. Like a fool I said I would have a look at it. :)

He uses "part number" to seach for stock and not description or category, if that part number is not in stock he thinks he has none. but if the exact same item is sourced from a different supplier, it has a different part number and therefor he has stock of the item, just not the same part number.
If I make a form bound to "tblItems" (see attached showing table design), I can put an unbound combobox on it based on part numbers and when a part number is selected, it opens that particular item record, and I can get the form to show me what stock I have, but how can I get the form to show me what stock I have of the same item which has a different part number? In other words, If I have no stock of a certain part number how can I view all other part numbers that relate to the exact same item?

I'm probably missing something simple, but I just can't seem to grasp it.

I have attached a picture of my table design so far. I think I may need another table just for part numbers, but I am unsure of how to link it to the items table.. (all primary keys are autonumber)  
Dbase.png
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Stephen Byrom
Asked:
Stephen Byrom
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2 Solutions
 
Boyd (HiTechCoach) Trimmell, Microsoft Access MVPCommented:
I like to use a junction table that allows tblItems record to be related (self join) other records in the same table  

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Stephen ByromWarehouse/ShippingAuthor Commented:
Are you saying I should create a junction table that joins to another instance of tblItems and use that junction table as the source of my search form?
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als315Commented:
You can try to do as in included sample (may be tlpkItemType is not correct table, but it uses idea of joining same items in table)
DB26868860.zip
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Boyd (HiTechCoach) Trimmell, Microsoft Access MVPCommented:
Almost.

Yes the junction table will link tblItems to tblItems.

For record source or row source I use a union query. The first Select will get the record that matches the part number. Then union with a select that finds any record linked  via the junction table to the part number.
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Stephen ByromWarehouse/ShippingAuthor Commented:
Hmmm.
Not used Union before, I'll have to look it up. Not sure what you mean

ps, Als315, cannot open your file.
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als315Commented:
Try this one DB26868860.zip
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Stephen ByromWarehouse/ShippingAuthor Commented:
Thanks als315, I managed to open that one.
I see that the subform is based on a select query but the "tlkpItemType" is a lookup table to categorise the items, (about 8 categories), but an idividual item can have the exact same properties except Part number.
I maybe not explaining myself very clear. It's difficult to try and put across what I mean
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Stephen ByromWarehouse/ShippingAuthor Commented:
One way of looking at it is this.
Each item has a unique primary key and Part number but that item can be duplicated in every aspect except the primary key and part number.
Maybe I should link the part number of each item in the table "tblItems" to another table consisting of just part numbers on a one to many basis?
Or am I making trouble for myself?
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als315Commented:
You can use table like tlkpItemType in my example and same parts in tblItems will have field with reference to this table and same items will have same reference, then you will be able to select similar parts.
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Stephen ByromWarehouse/ShippingAuthor Commented:
Thanks for your time on this, I will look into your suggestion later this evening when I get home and let you know.
Thanks again for your time.
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Stephen ByromWarehouse/ShippingAuthor Commented:
Thank you both for your time. I went with a Junction table, (self join) as the coach suggested and also gleened some insight on query building from als. I combined both and managed to get a form to show what I was after. So I thought it only fair to award points to each of you.

Thank you both for your time.
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