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02.19.2008 at 03:44PM PST, ID: 23176099
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6.6

Many to Many Relationship

Asked by BobRosas in Access Architecture/Design, SQL Server 2005

Tags: ,

I thought I had this many to many thing figured out and now Im very unsure.
I have these tables
tblClients
   ClientFileNo  PK(auto number)
   SSN
   FirstName
   Etc

tblFunds
   FundId  PK(auto number)
   FundSourceLkUpId  (Example Data: ES or VS&.see below)
   FundFromDate
   FundToDate

tblLkUpFunds    (this is just a lookup table forFundSourceLkUpId above)
   FundSourceLkUpID  PK(text)
   FundingSourceDesc
      Example data would be
               Fund       Description
                ES               Educational Services
                VS               Veterans Services

Now a Client can have many different Funds and a Fund can be for many Clients.
So I created a linking table for my many to many relationship
tblClientFund
   ClientFileNo PK
   FundID          PK

When I look at the tblClientFund data I can see that the ClientFileNo repeats.  But never does the FundId repeat.   With the structure I have now I dont think it ever would.  The dates that are part of the record in tblFunds make it highly unlikely.  Even if 2 Funds had the same dates the dates are allowed to change.
Im using FundID as the PK because the dates are different but its actually the field FundSourceLkUpID that is the Fund that many Clients can have.  But I cant make FundSourceLkUpID the key because it would repeat in the tblFunds.  Its the dates that make it unique.  

Is this not a true many to many?  Or how do I need to change my structure to make it work.  
Please help!
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About this solution

Zones: Access Architecture/Design, SQL Server 2005
Tags: VBA, Microsoft Access
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Solution Provided By: LSMConsulting
Participating Experts: 3
Solution Grade: A
 
 
[+][-]02.22.2008 at 09:48AM PST, ID: 20959642

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